Praxis Earth and Space Sciences study plan

Draw and label a cross-section of Earth's interior (crust, mantle, outer core, inner core, lithosphere, asthenosphere) from memory and annotate each layer with approximate thickness, composition, and physical state.

Explain how P-wave and S-wave behavior (refraction, shadow zones, velocity changes) constrains models of internal structure, and predict which stations record which phases for a given earthquake.

Sequence the major events of Earth's history on a proportional timeline from 4.6 Ga to present, marking the origin of life, the Great Oxidation Event, the Cambrian explosion, and the major mass extinctions.

Distinguish relative dating principles (superposition, original horizontality, cross-cutting relationships, inclusions, faunal succession) and apply them to unfamiliar outcrop descriptions.

Interpret a simple decay curve to calculate half-lives elapsed and parent/daughter ratios for radiometric ages, and state why different isotopes suit different time spans.

Classify the three plate boundary types and predict the associated seismicity, volcanism, topography, and metamorphic grade at each.

Relate the rock cycle to plate tectonics by tracing one igneous, one sedimentary, and one metamorphic rock from formation to a plausible tectonic setting.

Apply elastic rebound theory and the concepts of focus, epicenter, and magnitude versus intensity to interpret a described earthquake scenario.

Identify the principal seismic hazards (shaking, liquefaction, landslides, tsunamis) and match each to the geologic conditions that amplify it.

Identify the common rock-forming minerals by diagnostic properties (cleavage, hardness, streak, luster, reaction to acid) and distinguish them from the rocks they compose.

Classify igneous rocks by texture and composition and infer cooling history from grain size and mineral assemblage.

Classify clastic and chemical sedimentary rocks by grain size and composition, and interpret depositional environment from sedimentary structures such as cross-bedding, ripple marks, and graded bedding.

Distinguish foliated from nonfoliated metamorphic rocks and infer parent rock and metamorphic grade from mineral assemblage.

Explain mechanical and chemical weathering processes and predict which dominates in a given climate and bedrock setting.

Trace the hydrologic pathway of a raindrop across a landscape and explain how infiltration, runoff, evaporation, and transpiration partition precipitation.

Compare erosion and deposition by running water, groundwater, wind, waves, and glaciers, and identify the landforms diagnostic of each agent.

Interpret a stream hydrograph and a longitudinal profile in terms of discharge, gradient, base level, and sediment load.

Explain soil formation as a function of climate, parent material, topography, organisms, and time, and predict how soil profiles differ between biomes.

Evaluate a mass-wasting scenario and rank the roles of slope angle, water content, vegetation, and material strength.

Describe the physical and chemical stratification of the ocean and explain how temperature, salinity, and density vary with depth and latitude.

Explain the drivers of surface currents, upwelling, and the global thermohaline circulation, and predict the climatic effect of a given current pattern.

Relate tides to lunar and solar gravitational forcing, and distinguish spring, neap, semidiurnal, and diurnal tide patterns.

Interpret the coastal processes that shape shorelines and predict the shoreline response to a jetty, seawall, or sea-level rise.

Trace groundwater flow through an aquifer system, defining porosity, permeability, water table, recharge, and confinement, and evaluate a contamination scenario.

Interpret a station model and a surface weather map, decoding temperature, dew point, pressure, wind direction and speed, and frontal symbols.

Explain how solar heating, pressure gradients, Coriolis effect, and friction combine to produce global wind belts and the jet stream.

Apply the conditions for cloud formation and precipitation to predict cloud type and stability from a given temperature and humidity profile.

Distinguish the formation and hazards of tornadoes, thunderstorms, and tropical cyclones, and identify the seasonal and geographic conditions each requires.

Read a climate graph and distinguish weather from climate, identifying the controls that determine a location's climate.

Describe the formation and structure of the solar system and distinguish terrestrial from Jovian planets by size, density, composition, and orbital characteristics.

Explain Kepler's three laws and Newton's law of gravitation, and use them to compare orbital periods and speeds of two bodies.

Compare the Sun's internal structure and energy-generation process with its observable features such as sunspots, solar wind, and the solar cycle.

Classify stars by spectral type and position on the Hertzsprung-Russell diagram, and describe the evolutionary path of a low-mass and a high-mass star.

Explain the evidence for the Big Bang, including cosmic microwave background, redshift, and light-element abundances, and distinguish the major galaxy types.

Relate Earth's rotation, revolution, axial tilt, and precession to seasons, day length, Moon phases, eclipses, and the rock record of Milankovitch cycles.

Trace energy and matter flows through the Earth system (carbon, nitrogen, and rock cycles) and identify at least two feedback loops with their signs.

Explain how the biosphere, atmosphere, hydrosphere, and geosphere interact in a case study such as ocean acidification, volcanic forcing, or albedo change.

Design a classroom investigation that uses real Earth science data (seismic, weather, tidal, or satellite) and state the hypothesis, variables, and expected evidence.

Evaluate a scientific claim by identifying its assumptions, sources of uncertainty, and whether the data support the conclusion.

Interpret a graph or data table to identify trends, calculate a rate of change, and distinguish correlation from causation.