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RISE Science Grade 6 study materials
RISE Science Grade 6 study resources

RISE Science Grade 6 practice questions

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Question 1Earth and Space Science

Which layer of Earth is made mostly of solid iron and nickel and lies at the very center?

  1. The crust
  2. The mantle
  3. The inner core Correct answer.
  4. The outer core

Explanation

Earth's center is the inner core, where extreme pressure keeps iron and nickel solid despite very high temperatures. The outer core is also iron and nickel but is liquid, while the mantle and crust are rocky.

Question 2Earth and Space Science

A student observes that the Moon shows a full face, then a few days later a slightly smaller bright face. What causes the Moon's appearance to change this way?

  1. Clouds blocking part of the Moon
  2. Earth's shadow falling on the Moon
  3. The Moon orbiting Earth and showing different sunlit portions Correct answer.
  4. The Moon's rotation on its axis

Explanation

The Moon does not make its own light; we see the sunlit half, and as the Moon orbits Earth we view that sunlit half from changing angles. These changing views produce the phases.

Question 3Earth and Space Science

Which statement best describes the Sun in our solar system?

  1. A star that produces its own light and heat Correct answer.
  2. A moon orbiting the largest planet
  3. A planet that reflects light from distant stars
  4. A cloud of gas with no energy source

Explanation

The Sun is a star, a massive ball of hot gas that releases energy through nuclear fusion. That energy provides the light and heat for the solar system.

Question 4Earth and Space Science

In which order does water move through the water cycle after it evaporates from the ocean?

  1. Condensation, then precipitation, then collection Correct answer.
  2. Evaporation, then collection, then precipitation
  3. Collection, then evaporation, then condensation
  4. Precipitation, then condensation, then evaporation

Explanation

After evaporation, water vapor rises and cools, condensing into clouds; then it falls as precipitation and collects in bodies of water and the ground. This sequence repeats continuously.

Question 5Earth and Space Science

Fossils of the same ocean-dwelling species are found on continents now separated by a wide ocean. Which explanation best fits this evidence?

  1. Ocean water carried the fossils inland
  2. The fossils formed independently on each continent
  3. The continents were once joined and later moved apart Correct answer.
  4. The species swam across the ocean many times

Explanation

The theory of plate tectonics explains that continents move over time; landmasses once connected can split and drift apart. Matching fossils on distant continents support this idea.

Question 6Earth and Space Science

Which process most directly builds new ocean floor at a mid-ocean ridge?

  1. Deposition of river sediment
  2. Magma rising and cooling at the ridge Correct answer.
  3. Erosion by waves along the coast
  4. Melting of glaciers

Explanation

At mid-ocean ridges, tectonic plates pull apart and magma rises into the gap, cooling to form new crust. This seafloor spreading continuously creates new ocean floor.

Question 7Earth and Space Science

A region experiences a sudden shaking of the ground caused by movement along a fault. What is this event called?

  1. A volcano
  2. A tsunami
  3. An earthquake Correct answer.
  4. A landslide

Explanation

An earthquake is the shaking produced when stress built up in rocks is suddenly released along a fault. The other events listed are different hazards with different causes.

Question 8Earth and Space Science

Why do most volcanoes and earthquakes occur along plate boundaries?

  1. Plate boundaries have the most rainfall
  2. Plates move and interact mostly at their edges Correct answer.
  3. Boundaries are always at sea level
  4. Rivers carry heat to the boundaries

Explanation

Tectonic plates move relative to one another, and their edges are where stress, friction, and magma movement concentrate. This makes plate boundaries the main sites of earthquakes and volcanic activity.

Question 9Earth and Space Science

Which type of rock forms when melted rock cools and hardens?

  1. Fossil rock
  2. Igneous rock Correct answer.
  3. Metamorphic rock
  4. Sedimentary rock

Explanation

Igneous rock forms from cooling magma or lava. Sedimentary rock forms from compacted sediments, and metamorphic rock forms when existing rock is changed by heat and pressure.

Question 10Earth and Space Science

Wind and flowing water break down and carry away bits of rock. Which pair of terms names these two processes?

  1. Weathering and erosion Correct answer.
  2. Melting and cooling
  3. Condensation and evaporation
  4. Compaction and cementation

Explanation

Weathering breaks rock into smaller pieces, and erosion is the transport of that material by agents such as wind and water. Together they reshape Earth's surface.

Question 11Earth and Space Science

A river carries sand and mud into a lake. Over a long time the material settles in layers and hardens into rock. Which rock type results?

  1. Volcanic
  2. Sedimentary Correct answer.
  3. Igneous
  4. Metamorphic

Explanation

Deposited sediments that are compacted and cemented over time form sedimentary rock. Layers of settled sand and mud are the raw material for this process.

Question 12Earth and Space Science

Which property of soil is most directly related to how quickly water drains through it?

  1. Its temperature
  2. Its color
  3. Its smell
  4. Its particle size Correct answer.

Explanation

Particle size controls the spaces between soil grains: sandy soils drain quickly because of large pores, while clay-rich soils hold water. Drainage therefore depends mainly on particle size.

Question 13Earth and Space Science

Which everyday observation is best explained by the tilt of Earth's axis?

  1. Seasons change through the year Correct answer.
  2. The Moon has phases
  3. The Sun rises in the east
  4. Day and night alternate every 24 hours

Explanation

Because Earth's axis is tilted, different hemispheres receive more direct sunlight at different times of year, producing seasons. The tilt matters because Earth orbits the Sun.

Question 14Earth and Space Science

Earth completes one full rotation on its axis in about how much time?

  1. 365 days
  2. 24 hours Correct answer.
  3. 30 days
  4. 7 days

Explanation

One rotation of Earth relative to the Sun takes about 24 hours and produces the cycle of day and night. Longer periods listed correspond to other motions.

Question 15Earth and Space Science

Why does the Moon have a much weaker pull on objects than Earth does?

  1. The Moon has less mass than Earth Correct answer.
  2. The Moon spins faster than Earth
  3. The Moon is farther from the Sun
  4. The Moon has no gravity at all

Explanation

Gravitational pull depends on mass, so a less massive body exerts a weaker gravitational force on objects at its surface. The Moon's smaller mass explains its lower gravity.

Question 16Earth and Space Science

Which list places the planets of the inner solar system in order from the Sun outward?

  1. Mercury, Venus, Earth, Mars Correct answer.
  2. Earth, Mars, Venus, Mercury
  3. Venus, Mercury, Mars, Earth
  4. Mars, Earth, Venus, Mercury

Explanation

The four planets closest to the Sun, in order, are Mercury, Venus, Earth, and Mars. These are the rocky inner planets.

Question 17Earth and Space Science

A comet's tail always points away from the Sun. What causes this?

  1. Solar wind and radiation push material away from the Sun Correct answer.
  2. The comet is pulled backward by its own gravity
  3. The comet's tail is fixed to its forward motion
  4. Earth's magnetic field repels the tail

Explanation

As a comet nears the Sun, its ice turns to gas, and solar wind and sunlight push that gas and dust away from the Sun. The tail therefore always extends away from the Sun regardless of the comet's direction of travel.

Question 18Earth and Space Science

Which statement correctly describes the relationship between the Sun and the planets?

  1. The Sun orbits the planets because of their gravity
  2. The Sun and planets orbit each other equally
  3. Planets orbit the Sun because of magnetic attraction
  4. Planets orbit the Sun because of the Sun's gravity Correct answer.

Explanation

The Sun is far more massive than any planet, so its gravity dominates and keeps the planets in orbit around it. Gravity, not magnetism, governs orbital motion.

Question 19Earth and Space Science

Which human activity most directly increases the amount of carbon dioxide in the atmosphere?

  1. Recycling glass bottles
  2. Building a dam on a river
  3. Planting trees in a forest
  4. Burning fossil fuels for electricity Correct answer.

Explanation

Burning fossil fuels releases carbon that was stored underground into the atmosphere as carbon dioxide. This is a major human contribution to rising atmospheric carbon dioxide.

Question 20Earth and Space Science

Which of these is a renewable energy resource?

  1. Natural gas
  2. Coal
  3. Petroleum
  4. Wind Correct answer.

Explanation

Renewable resources are naturally replenished on human timescales; wind is continually produced by the atmosphere. Coal, natural gas, and petroleum are fossil fuels that take millions of years to form.

Question 21Earth and Space Science

A student notes that a coastal city is usually cooler in summer than an inland city at the same latitude. Which factor best explains this?

  1. The inland city has more wind
  2. Water heats and cools more slowly than land Correct answer.
  3. The coastal city is closer to the Sun
  4. The coastal city has a longer day in summer

Explanation

Water has a higher heat capacity than land, so it absorbs and releases heat slowly and moderates nearby temperatures. This keeps coastal areas cooler in summer than inland areas.

Question 22Earth and Space Science

Which of these best describes the atmosphere's role in protecting life on Earth?

  1. It blocks all sunlight from reaching the surface
  2. It stops Earth from rotating
  3. It absorbs or reflects some harmful solar radiation Correct answer.
  4. It prevents all meteors from entering

Explanation

Gases in the atmosphere, including ozone, absorb or reflect much of the harmful ultraviolet radiation from the Sun. This shields living things from damaging radiation.

Question 23Earth and Space Science

Air pressure is greatest at which location?

  1. At sea level Correct answer.
  2. In the upper atmosphere
  3. Inside a cloud
  4. At the top of a high mountain

Explanation

Air pressure is the weight of the air above a point, so it is greatest at the lowest elevations where the most air lies overhead. Pressure decreases as you go higher.

Question 24Earth and Space Science

Warm, moist air rises, cools, and forms clouds. Which process in the water cycle does this describe?

  1. Evaporation
  2. Condensation Correct answer.
  3. Precipitation
  4. Collection

Explanation

Condensation is the change of water vapor into liquid droplets as air cools, forming clouds. Evaporation is the reverse change, and precipitation and collection occur later.

Question 25Earth and Space Science

Scientists find that a layer of rock contains older fossils below younger fossils, with no layers overturned. What can they conclude?

  1. The rock layers formed at the same time
  2. The upper fossils are older than the lower fossils
  3. The lower fossils are older than the upper fossils Correct answer.
  4. All the fossils are the same age

Explanation

The law of superposition states that in undisturbed sedimentary layers, lower layers are older than the layers above them. Fossils in lower layers are therefore older.

Question 26Earth and Space Science

Which layer of Earth is the thinnest and consists of the crust plus the rigid uppermost mantle?

  1. The asthenosphere
  2. The outer core
  3. The lithosphere Correct answer.
  4. The inner core

Explanation

The lithosphere is the rigid outer shell made of the crust and the top of the mantle, and it is broken into tectonic plates. The other layers listed are either deeper or, in the case of the asthenosphere, softer and below the lithosphere.

Question 27Earth and Space Science

Oceanic crust is generally denser than continental crust. What happens when the two meet at a convergent boundary?

  1. The two plates push apart and form a ridge
  2. Both plates float side by side without moving
  3. The denser oceanic plate sinks beneath the continental plate Correct answer.
  4. The continental plate sinks beneath the oceanic plate

Explanation

At a convergent boundary the denser plate is forced downward into the mantle in a process called subduction. Oceanic crust is denser than continental crust, so the oceanic plate subducts.

Question 28Earth and Space Science

A scientist measures how long it takes seismic waves to travel from an earthquake to several distant stations. What can be determined from these arrival times?

  1. The temperature of the mantle
  2. The location of the earthquake's focus Correct answer.
  3. The depth of the ocean floor
  4. The age of the surrounding rocks

Explanation

The difference in arrival times of P and S waves at multiple stations allows scientists to triangulate the earthquake's focus. This method uses wave speed differences, not rock age or mantle temperature.

Question 29Earth and Space Science

A volcano forms above a rising column of hot mantle material that stays fixed while a plate moves over it. What is this column called?

  1. A hot spot Correct answer.
  2. A trench
  3. A mid-ocean ridge
  4. A fault line

Explanation

A hot spot is a fixed plume of hot mantle material that produces volcanoes as a plate drifts over it, forming chains of islands. Fault lines, trenches, and ridges form from plate interactions rather than fixed plumes.

Question 30Earth and Space Science

Which process slowly wears down a mountain by breaking rock into smaller pieces through freezing and thawing of water?

  1. Compaction
  2. Erosion
  3. Deposition
  4. Weathering Correct answer.

Explanation

Weathering is the breakdown of rock in place, including freeze-thaw cycles that crack rock apart. Erosion moves the broken material, deposition lays it down, and compaction presses sediments together.

Question 31Earth and Space Science

A geologist finds a sedimentary rock layer containing shell fossils that are identical to shells of animals living in shallow seas today. What does this most likely indicate about the area where the rock formed?

  1. It was once a volcanic mountain peak
  2. It was once covered by a shallow sea Correct answer.
  3. It has always been a dry desert
  4. It was never affected by water

Explanation

Fossils of shallow-sea organisms in rock indicate that the area was once underwater. The presence of marine shells is direct evidence of a past shallow sea environment.

Question 32Earth and Space Science

Which statement best explains why the same side of the Moon always faces Earth?

  1. The Moon rotates once for each orbit it makes around Earth Correct answer.
  2. Earth's gravity prevents the Moon from turning
  3. The Moon orbits Earth exactly once each day
  4. The Moon does not rotate on its axis at all

Explanation

The Moon's rotation period equals its orbital period, a condition called synchronous rotation, so the same hemisphere always faces Earth. It does rotate, but at the same rate it revolves.

Question 33Earth and Space Science

What causes the seasons on Earth?

  1. Changes in Earth's distance from the Sun
  2. Variations in the Sun's brightness
  3. The rotation of Earth on its axis each day
  4. The tilt of Earth's axis as it orbits the Sun Correct answer.

Explanation

Earth's axis is tilted, so different hemispheres receive more direct sunlight at different points in the orbit, producing seasons. Distance changes are small and do not explain opposite seasons in the two hemispheres.

Question 34Earth and Space Science

A solar eclipse occurs when the Moon passes directly between Earth and the Sun. Which arrangement produces this event?

  1. Sun, then Earth, then Moon in a line
  2. Earth, then Sun, then Moon in a line
  3. Moon, then Earth, then Sun in a line
  4. Sun, then Moon, then Earth in a line Correct answer.

Explanation

During a solar eclipse the Moon moves between the Sun and Earth, blocking the Sun's light from reaching part of Earth. The order is Sun, Moon, Earth.

Question 35Earth and Space Science

Which planet is the largest in our solar system?

  1. Jupiter Correct answer.
  2. Earth
  3. Neptune
  4. Saturn

Explanation

Jupiter is the largest planet, with a mass greater than all the other planets combined. Saturn is second largest but still smaller than Jupiter.

Question 36Earth and Space Science

Why does the Sun appear much larger and brighter than other stars in the night sky?

  1. It is the only star that gives off light
  2. It is larger than all other stars
  3. It is much hotter than every other star
  4. It is much closer to Earth than other stars Correct answer.

Explanation

The Sun is a typical star but is vastly closer to Earth than any other star, so it appears far larger and brighter. Its apparent size and brightness depend mainly on distance.

Question 37Earth and Space Science

Which force keeps the planets in orbit around the Sun?

  1. Magnetism
  2. Friction
  3. Air pressure
  4. Gravity Correct answer.

Explanation

Gravity is the attractive force between the Sun and each planet, and it provides the pull that keeps planets in orbit. Magnetism, friction, and air pressure do not govern planetary orbits.

Question 38Earth and Space Science

A rocky object enters Earth's atmosphere, heats up, and burns brightly, appearing as a streak of light. What is this object called?

  1. An asteroid
  2. A meteor Correct answer.
  3. A comet
  4. A satellite

Explanation

A meteor is the streak of light produced when a small space rock burns up in Earth's atmosphere. Asteroids and comets are larger bodies in space, and satellites are human-made or natural orbiting objects.

Question 39Earth and Space Science

Which statement best describes how the greenhouse effect warms Earth?

  1. Gases in the atmosphere trap heat radiated from Earth's surface Correct answer.
  2. Ozone reflects sunlight back into space
  3. Clouds absorb all the heat from the Sun before it reaches the ground
  4. The atmosphere blocks all sunlight from reaching Earth

Explanation

Greenhouse gases absorb outgoing heat energy from Earth's surface and re-emit it, keeping the planet warmer than it would otherwise be. They do not block sunlight or absorb all incoming solar heat.

Question 40Earth and Space Science

Burning fossil fuels releases carbon dioxide. Which effect does this increase most directly have on the atmosphere?

  1. It blocks all ultraviolet light from the Sun
  2. It strengthens the greenhouse effect and raises average temperatures Correct answer.
  3. It reduces the amount of oxygen in the air to zero
  4. It stops the water cycle from occurring

Explanation

Carbon dioxide is a greenhouse gas, so adding more of it traps more heat and tends to raise global average temperatures. It does not eliminate oxygen, stop the water cycle, or block all ultraviolet light.

Question 41Earth and Space Science

Which resource is considered nonrenewable because it forms over millions of years?

  1. Wind
  2. Coal Correct answer.
  3. Flowing water
  4. Sunlight

Explanation

Coal forms from ancient plant material over millions of years and is used far faster than it forms, so it is nonrenewable. Sunlight, wind, and flowing water are continuously replenished.

Question 42Earth and Space Science

Which practice most directly helps conserve a limited supply of fresh water?

  1. Running the dishwasher half full
  2. Leaving sprinklers running all day
  3. Fixing leaky pipes and turning off taps when not in use Correct answer.
  4. Washing a car with a running hose for hours

Explanation

Repairing leaks and shutting off taps reduces wasted water, directly conserving the supply. The other practices use water inefficiently and increase waste.

Question 43Earth and Space Science

Which of these best describes how the atmosphere helps regulate Earth's temperature?

  1. It traps some outgoing heat while allowing most sunlight to pass through Correct answer.
  2. It makes Earth colder than outer space would be
  3. It reflects all sunlight so none reaches the surface
  4. It prevents any heat from leaving Earth's surface

Explanation

The atmosphere lets most incoming sunlight through but absorbs and re-emits some outgoing heat, moderating temperature. It does not reflect all sunlight or trap every bit of heat.

Question 44Earth and Space Science

A weather map shows a warm front approaching a town. Which change is most likely as the front arrives?

  1. Steady rain followed by warmer air Correct answer.
  2. Heavy snow followed by freezing temperatures
  3. Clear skies followed by colder air
  4. Sudden strong winds with no temperature change

Explanation

A warm front occurs when warm air rises over cooler air, often producing steady precipitation followed by warmer temperatures. Colder air and snow are associated with cold fronts.

Question 45Earth and Space Science

Which tool is used to measure the amount of water vapor in the air?

  1. A thermometer
  2. An anemometer
  3. A barometer
  4. A hygrometer Correct answer.

Explanation

A hygrometer measures humidity, which is the amount of water vapor in the air. Barometers measure air pressure, anemometers measure wind speed, and thermometers measure temperature.

Question 46Earth and Space Science

Why does a valley breeze usually blow upslope during the day?

  1. Air over the slopes cools and sinks toward the valley
  2. Wind always blows from higher to lower elevation
  3. Air over the warmed slopes rises and cooler air moves in to replace it Correct answer.
  4. The valley floor becomes colder than the surrounding slopes

Explanation

During the day, slopes heat faster than the valley floor, so air over the slopes rises and cooler valley air flows upslope to replace it. This is driven by differences in heating, not by elevation alone.

Question 47Earth and Space Science

Which of these is the main reason the ocean has a moderating effect on nearby coastal climates?

  1. Water is always warmer than land
  2. Water produces no evaporation
  3. Water reflects all sunlight
  4. Water heats and cools more slowly than land Correct answer.

Explanation

Water has a high heat capacity, so it absorbs and releases heat slowly, keeping coastal temperatures more moderate. It does not reflect all sunlight or avoid evaporation.

Question 48Earth and Space Science

Which process moves groundwater from Earth's surface downward into an aquifer?

  1. Evaporation
  2. Infiltration Correct answer.
  3. Condensation
  4. Precipitation

Explanation

Infiltration is the movement of water from the surface into soil and rock, eventually reaching an aquifer. Condensation, evaporation, and precipitation describe other parts of the water cycle.

Question 49Earth and Space Science

A scientist finds that a rock sample contains a radioactive element with a half-life of 10 million years and that half of the element has decayed. Approximately how old is the sample?

  1. 10 million years Correct answer.
  2. 100 million years
  3. 20 million years
  4. 5 million years

Explanation

After one half-life, half of the radioactive atoms have decayed. Since one half-life is 10 million years, a sample with half remaining is about 10 million years old.

Question 50Earth and Space Science

Which evidence best supports the idea that continents have moved over time?

  1. The presence of deserts on several continents
  2. The changing phases of the Moon
  3. Matching fossils and rock layers found on continents now separated by oceans Correct answer.
  4. The rotation of Earth on its axis

Explanation

Identical fossils and rock formations on continents now far apart suggest they were once joined and later drifted apart. Deserts, rotation, and lunar phases do not provide evidence of continental movement.