WACE ATAR Earth & Environmental Science study guide
WACE ATAR Earth & Environmental Science · Work through your exam, one topic at a time.
The WACE ATAR Earth and Environmental Science course is a Western Australian senior secondary subject assessed through a written external examination set by the School Curriculum and Standards Authority (SCSA). It suits students who want a science pathway into university and who are curious about how the solid Earth, atmosphere, oceans and living systems interact. The WACE ATAR Earth & Environmental Science study guide has 7 sections and about 2,405 words.
01Earth Systems and the Geosphere
Earth & Environmental Science treats Earth as a set of interacting reservoirs: the geosphere (solid Earth, crust to core), atmosphere , hydrosphere (including cryosphere), and biosphere . Energy from the Sun and internal heat from radioactive decay and primordial heat drive all transfers.
357 words, about 2 min02Earth Materials: Minerals, Rocks and Their Identification
A mineral is naturally occurring, inorganic, solid, with a definite chemical composition (within limits) and an ordered internal structure. Anything failing one criterion is not a mineral (glass lacks order; coal is organic).
312 words, about 2 min03Plate Tectonics: Evidence, Boundaries and Driving Forces
Plate tectonics explains the lithosphere as a mosaic of rigid plates moving over the weaker asthenosphere . Evidence: matching continental margins and fossils (Wegener's Pangaea), palaeomagnetic stripes recording sea-floor spreading, ocean-floor age increasing away from ridges, earthquake and volcano belts, and GPS-measured motion (centimetres per year).
298 words, about 1 min04Geological Structures and Earth History
Stratigraphy rests on superposition (oldest at the bottom), original horizontality, lateral continuity and cross-cutting relationships (a feature cutting another is younger). Uniformitarianism assumes the same processes operated in the past.
285 words, about 1 min05The Atmosphere, Weather and Climate
The atmosphere is ~78% nitrogen, 21% oxygen, with trace greenhouse gases (CO₂, water vapour, methane). Temperature falls through the troposphere (where weather occurs), rises in the stratosphere (ozone absorbs UV), and varies above.
310 words, about 2 min06The Hydrosphere, Oceans and Water Resources
The hydrosphere includes oceans (about 97% of water), glaciers, groundwater, lakes, rivers and the atmosphere. The hydrological cycle moves water via evaporation, transpiration, condensation, precipitation, infiltration, runoff and groundwater flow.
276 words, about 1 min07Biogeochemical Cycles, Soils and Ecosystems
Carbon cycle : photosynthesis, respiration, decomposition, combustion, weathering and ocean exchange. Reservoirs: oceans (largest), rocks/fossil fuels, atmosphere, biosphere.
567 words, about 3 min