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HSC Year 12 · New South Wales

Earth and Environmental Science Scaling HSC 2026: Does It Scale Up or Down?

HSC Earth and Environmental Science scales down in New South Wales. In UAC's Report on the Scaling of the 2025 NSW Higher School Certificate, Earth and Environmental Science students averaged an HSC mark of 37.3 out of 50 per unit and a scaled mark of 22.8; the median scaled mark was 23.2 against a median HSC mark of 38.0.

Does HSC Earth and Environmental Science scale up or down?

Earth and Environmental Science scales down in New South Wales.

In UAC's Report on the Scaling of the 2025 NSW Higher School Certificate, Earth and Environmental Science students averaged an HSC mark of 37.3 out of 50 per unit and a scaled mark of 22.8; the median scaled mark was 23.2 against a median HSC mark of 38.0. UAC does not publish a per-subject raw-to-scaled conversion for this course in a form we can quote exactly, so there is no figure on this page — the direction above is sourced from the UAC scaling report linked below, and should be read as directional rather than numeric.

You can't change the scaling. You can change the raw mark.

Scaling is decided by your cohort, after the exam, and nothing you do moves it. The raw mark is the only part of this you control — and the Earth and Environmental Science hub is 20 full-length model exams with mark-by-mark answer guides, revision notes, practice questions and flashcards, built for exactly that.

Preview Earth and Environmental Science free →UAC ATAR calculator

The hub shows a sample revision note extract, one full exam question with its worked answer and the complete list of every exam and note title — no account needed to look around. Unlocking Earth and Environmental Science for life is $20 once, or $50 for any three subjects. See what's included →

What Earth and Environmental Science actually asks of you

The HSC exam is one written paper worth 100 marks: 5 minutes reading time and 3 hours working time. Section I has 20 marks of objective-response (multiple-choice) questions, about 35 minutes. Section II is worth 80 marks: questions may contain parts, with 20 to 25 items in total and at least two items worth 7 to 9 marks; allow about 2 hours 25 minutes. Modules 5 to 8 carry approximately equal weighting and Working Scientifically skills are integrated throughout. A Geological Time Scale is provided; NESA-approved calculators, a pair of compasses, a protractor and set squares may be used. Your HSC mark is the average of your exam mark and your moderated school assessment mark; the Year 12 school-based components are Skills in working scientifically (60%) and Knowledge and understanding of course content (40%).

The Earth and Environmental Science exam is Thursday 15 October 2026, 9:25 am (3 hours 5 minutes (5 minutes reading plus 3 hours working)). Source: HSC timetable.

The 5 areas of study you are examined on

From the Earth and Environmental Science Stage 6 Syllabus (2017) — HSC Year 12 course (Modules 5–8).

  • Module 5: Earth’s Processes
    How today’s biosphere began and developed: evidence for the origin of organic molecules (Urey and Miller’s experiments, communities around black smokers, meteorites and panspermia), cyanobacteria and stromatolites, the Ediacaran and Cambrian fauna and the conquest of land. How life changed the geosphere, atmosphere and hydrosphere, including oxygen and banded iron formations. Modelling the plate tectonic supercycle and its effects on climate and evolution. Mould, cast and trace fossils, index fossils, uniformitarianism, superposition and absolute dating used to date events such as the Cambrian radiation and mass extinctions.
  • Module 6: Hazards
    Predicting where earthquakes and effusive or explosive eruptions occur from plate boundaries, and why earthquake focus depth changes across convergent and divergent boundaries. Earthquake hazards (ground motion, tsunamis) and volcanic hazards (ash, lava flows, lahars, gases), magma type and explosivity, and the point at which a hazard becomes a disaster. Impacts of eruptions on the biosphere and atmosphere, including a case study such as Mount Pinatubo; hailstorms, east coast lows, droughts, floods and bushfires and how human activity can make some disasters more frequent or severe. Evaluating prediction technologies, building codes, warning systems, education and meteorological forecasting.
  • Module 7: Climate Science
    The natural greenhouse effect and natural causes of climate variation on different timescales: the plate tectonic supercycle, the Deccan and Siberian Traps, changes in Earth’s orbit, and ocean circulation. Ancient evidence (pollen, rock types, fossils and microfossils, isotope ratios in rocks and deep-sea sediments) and recent evidence (ice cores, dendrochronology, Aboriginal art sites, instrumental records, isotopes in speleothems and corals). The anthropogenic greenhouse effect, ocean acidification and flow-on effects on weather, ice and species ranges. Evaluating mitigation and adaptation strategies, including urban design, geo-engineering, alternative energy and agricultural practices of Aboriginal and Torres Strait Islander Peoples and other cultural groups.
  • Module 8: Resource Management
    Australia’s renewable resources and where they are; the environmental and cultural-site impacts of open-pit, underground and drilling operations and how mined land is reclaimed. Case studies of traditional owners’ involvement in planning, mining and restoration, and of an important Australian resource (how it is found, extracted, used and managed sustainably, and its past, present and future importance). Investigating waste composition, solid-waste management options and the sustainability of a named option. Definitions of sustainability, overharvesting, water pollution and habitat destruction, and Aboriginal and Torres Strait Islander Peoples as sustainable resource managers.
  • Working Scientifically skills and depth studies
    Seven skill outcomes run through the course: questioning and predicting, planning and conducting investigations, processing data, analysing data, problem solving and communicating. In the exam these appear as identifying variables, writing valid methods with safety measures, constructing tables, graphs and flow charts, calculating percentage change or periodicity, judging validity and reliability, reading the Geological Time Scale and building evidence-based arguments. Depth studies (at least 15 hours in Year 12), practical investigations (at least 35 hours) and one Year 12 fieldwork exercise are school-assessed.

Full Earth and Environmental Science study-design guide →

How scaling works in New South Wales

In New South Wales, NESA reports an HSC mark for each course, but the ATAR is not built from those marks. UAC takes the raw examination and assessment marks and scales each course separately, so that a mark means the same thing no matter which course it came from. A course whose students perform strongly across everything else they study is scaled up; a course whose students perform less strongly elsewhere is scaled down. UAC then adds your best 10 units of scaled marks: the best two units of English, which are compulsory, plus the best eight remaining units. That aggregate is ranked statewide and reported as an ATAR. Scaled marks are usually lower than HSC marks, and the statewide average scaled mark is close to 25 out of 50.

Source: official UAC scaling report (PDF). Last checked 2026-08-18.

What scaling is not

Scaling is not a difficulty rating and it is not a bonus. It compares how the students in one subject performed across every other subject they took, so a subject scales down because of its cohort, not because of the paper. The consequence is practical: you cannot scale your way out of a weak result. The only lever you control is the raw mark, and the fastest way to move that is full-length timed practice against the real exam format.

HSC Earth and Environmental Science practice examsUAC ATAR calculator

Questions

Does HSC Earth and Environmental Science scale up or down?

In UAC's Report on the Scaling of the 2025 NSW Higher School Certificate, Earth and Environmental Science students averaged an HSC mark of 37.3 out of 50 per unit and a scaled mark of 22.8; the median scaled mark was 23.2 against a median HSC mark of 38.0. We do not publish a scaled figure for this course, because UAC does not release a per-subject conversion we can quote exactly. The UAC scaling report is the authority.

How does subject scaling work in New South Wales?

In New South Wales, NESA reports an HSC mark for each course, but the ATAR is not built from those marks. UAC takes the raw examination and assessment marks and scales each course separately, so that a mark means the same thing no matter which course it came from. A course whose students perform strongly across everything else they study is scaled up; a course whose students perform less strongly elsewhere is scaled down. UAC then adds your best 10 units of scaled marks: the best two units of English, which are compulsory, plus the best eight remaining units. That aggregate is ranked statewide and reported as an ATAR. Scaled marks are usually lower than HSC marks, and the statewide average scaled mark is close to 25 out of 50.

Should I choose Earth and Environmental Science because of how it scales?

Scaling adjusts a whole cohort, not one student, so choosing a subject you will struggle in because it scales up is usually a worse trade than doing well in one that scales down. Check the prerequisites for the course you want first, then your interest and workload, and treat scaling as a tie-breaker. Scaling is also recalculated every year, so the figures in any report describe a past cohort rather than the year you are sitting.

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