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WACE Earth and Environmental Science: complete 2026 guide to Year 12 ATAR Units 3 and 4

A complete 2026 guide to WACE Year 12 ATAR Earth and Environmental Science (Units 3 and 4). How the 50 percent school assessment and 50 percent external examination combine, what Unit 3 (managing Earth resources) and Unit 4 (Earth hazards and climate change) cover, and links to every dot-point answer we have written.

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WACE ATAR Earth and Environmental Science is the Year 12 sequence made of Unit 3 (Managing Earth resources) and Unit 4 (Earth hazards and climate change), set by the School Curriculum and Standards Authority (SCSA). Both units are examinable in the single external written examination at the end of the year.

This page is the index. Below you will find how the course is assessed, what each unit covers, and links to every dot-point answer we have written for WACE Year 12 Earth and Environmental Science.

How the course is assessed in 2026

The ATAR result is built from two equally weighted halves.

School assessment: 50 percent. Set and marked by your school against the SCSA assessment table for Earth and Environmental Science. It combines science inquiry skills (practical investigations, fieldwork, data analysis and evaluation), extended response and topic tests, and school examinations across Units 3 and 4. School marks are statistically moderated against the external examination so schools are compared fairly.

External examination: 50 percent. A single written paper set and marked by SCSA, sat at the end of Year 12. It covers both Unit 3 and Unit 4 and usually includes multiple choice, short answer and extended response, with data interpretation and diagram work.

Your two halves combine after moderation to produce the final course mark that TISC then scales into your ATAR. The exact internal weightings of each school assessment type sit in the current SCSA assessment table, so confirm them against the official syllabus and your school assessment outline.

Unit 3: Managing Earth resources

Unit 3 develops how Earth forms resources and how they are used sustainably.

Resource formation
How magmatic, hydrothermal, sedimentary and weathering processes form mineral resources, how coal, oil and gas form, and how renewable energy resources are driven by continuous energy flows.
Biogeochemical cycles and ecosystem services
The carbon, nitrogen and water cycles, their reservoirs and fluxes, the ecosystem services they sustain, and how human activity disrupts them.
Resource extraction and impacts
How mining and extraction affect the geosphere, hydrosphere, atmosphere and biosphere, including acid mine drainage, and how rehabilitation works and where it falls short.
Sustainable management
Balancing extraction with replenishment, maximum sustainable yield, and how monitoring and modelling guide management of water, fisheries and biota at local, regional and global scales.

Unit 4: Earth hazards and climate change

Unit 4 builds the science of geological hazards and of a changing climate.

Volcanic eruptions and earthquakes
How plate boundary processes generate these hazards, the difference between magnitude and intensity, and the Ring of Fire.
Tsunamis and hazard management
How tsunamis form, the difference between hazard and risk, and how prediction, warning and mitigation reduce impacts.
Natural climate change
Milankovitch cycles, solar and volcanic forcing, feedbacks, and proxy evidence such as ice cores, sediments and tree rings.
Anthropogenic climate change
The enhanced greenhouse effect, human emissions, the evidence, impacts across Earth systems, and mitigation and adaptation responses.

Our 2026 WACE Earth and Environmental Science dot-point answers

Every link below is a focused answer to one SCSA dot point. Each page identifies the dot point, gives the worked answer with examples, and flags the most common mistakes.

Unit 3: Managing Earth resources

Unit 4: Earth hazards and climate change

How to use this hub

If you are starting Unit 3 this term: read resource formation first, then biogeochemical cycles. They underpin the extraction impacts and sustainable management dot points later in the unit.

If you are revising resource management: work through extraction and impacts, then sustainable management, and practise linking each impact to a specific Earth sphere.

If you are starting Unit 4: read volcanic eruptions and earthquakes first, because plate tectonics underpins tsunamis, and then move to the climate dot points, where natural change sets up human-caused change.

If you are weeks from the external examination: revise both units fully, because the paper draws on each. Practise past SCSA papers under timed conditions, focusing on data interpretation and extended response.

The system around the course

WACE Earth and Environmental Science sits inside the wider WACE ATAR system administered by SCSA. For the official syllabus, assessment outline and past ATAR examination papers, refer to scsa.wa.edu.au.

Every guide on this hub was written by ExamExplained (an initiative of Better Tuition Academy and XLev) and is independent of SCSA.

The WACE system, explained

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Common questions about Earth and Environmental Science

How is WACE Year 12 ATAR Earth and Environmental Science assessed in 2026?
The ATAR course is assessed 50 percent school assessment and 50 percent external written examination set and marked by SCSA. The school assessment combines science inquiry (practical and field investigations), extended response and tests, and school examinations across Units 3 and 4. The external examination is a single written paper at the end of Year 12 covering both units. The exact internal weightings sit in the current SCSA assessment table, so confirm them against your school outline and the official syllabus.
What does Earth and Environmental Science Unit 3 cover?
Unit 3 is Managing Earth resources. It covers how Earth processes form renewable and non-renewable mineral and energy resources, the biogeochemical cycles (carbon, nitrogen and water) that sustain ecosystem services, the effects of resource extraction on the geosphere, hydrosphere, atmosphere and biosphere, rehabilitation, and how monitoring and modelling support sustainable management of renewable resources such as water and fisheries.
What does Earth and Environmental Science Unit 4 cover?
Unit 4 is Earth hazards and climate change. It covers how plate tectonics causes volcanic eruptions and earthquakes, how tsunamis form, how Earth hazards are predicted and mitigated, the natural causes of climate change and the proxy evidence for past climates, and the enhanced greenhouse effect and human-caused climate change with mitigation and adaptation responses.
How is the external examination structured?
The external ATAR examination is a single written paper sat at the end of Year 12. It draws on both Unit 3 and Unit 4 and typically includes multiple choice, short answer and extended response sections. Expect data interpretation, map and diagram reading, and extended written responses, so earlier resource and cycle content stays examinable alongside hazards and climate. Confirm current timing and section structure against the SCSA syllabus and past papers.
Is Earth and Environmental Science useful for university courses?
Earth and Environmental Science supports pathways into environmental science, geology, geography, mining and resource engineering, agriculture and sustainability. It pairs well with chemistry, geography and the other sciences. Always check current course prerequisites with TISC and the individual WA universities, because requirements change.
How does Earth and Environmental Science scale for the ATAR?
SCSA scaling adjusts marks relative to how the cohort performs across all their courses, and final scaling is applied by TISC each year. Scaling varies year to year and depends on the cohort, so the most reliable strategy is to maximise your raw achievement in both the school assessment and the external examination rather than relying on scaling.