HSC Earth and Environmental Science exam 2026Exam: Thu 15 Oct · NESA timetable
Your HSC Earth and Environmental Science exam:
When and how long
- Earth and Environmental Science9.25 am to 12.30 pm3 h 5 min in total, including reading time
NESA: the exam start time shown on your timetable is when reading time begins, and you must arrive well before it. Finishing times marked approximate are shown as approx.
Source: 2026 HSC written exam timetable (NESA), checked Wednesday 23 September 2026. Where a start time, reading time or duration isn't shown, the timetable doesn't publish it: check your personal timetable and the front of your paper.
Most-examined dot points
From 268 questions on the official NESA papers (2019 to 2025), mapped to the syllabus. Past frequency is a guide to what to secure, not a prediction.
- Fossils and geological time44 questions · examined in 7 of 7 years
- Carbon cycle and the greenhouse effect30 questions · examined in 7 of 7 years
- Sustainability and Indigenous land management23 questions · examined in 7 of 7 years
- Evidence for climate change20 questions · examined in 7 of 7 years
- Hazard monitoring and risk management20 questions · examined in 7 of 7 years
- Volcanic hazards20 questions · examined in 7 of 7 years
- Oceans and climate15 questions · examined in 6 of 7 years
- Evidence for plate tectonics14 questions · examined in 7 of 7 years
Night-before and exam-morning checklists
The night before
- Check your personalised timetable on Students Online: the start time shown is when reading time begins.[2]
- Confirm your venue and the start time.[1]
- Pack a clear bag: several black pens (no erasable ink), 2B pencils, sharpener, eraser and a ruler.[1]
- Pack an approved calculator (check NESA's list) and a compass or protractor if the exam needs them.[1]
- Fill a clear, label-free water bottle.[1]
- A plain watch only if you want one (no smart or programmable watch); it goes on the desk.[1]
- Stop revising around 7 to 8 pm, set two alarms and sleep.[1]
Exam morning
- Eat a real breakfast.[1]
- Arrive well before the start time to allow for seating and checks.[2]
- Leave your phone and other electronic devices outside the exam room.[1]
- Use the bathroom before you go in.[1]
- In reading time, read and plan only: no writing, marking or annotating.[1]
- You can't leave in the first hour or the last 15 minutes.[1]
Exam-week survival kit: The last 7 days · The night before and exam morning · What to bring, and what's banned · How to use reading time · If you're sick or something goes wrong · Handling exam-week stress.
Last-week revision
- 2025 past paperWalkthrough, with a link to the official NESA paper
- 2024 past paperWalkthrough, with a link to the official NESA paper
- Exam trendsEvery dot point by how often it is examined
- FlashcardsSpaced-repetition cards from the syllabus pages
Syllabus by module
HSC Earth and Environmental Science cram sheet
Key formulas, definitions and facts copied from our Earth and Environmental Science syllabus pages, most-examined topics first. One page when printed.
Module 5: Earth's Processes
A mineral is a naturally occurring, inorganic solid with a definite (or narrowly variable) chemical composition and an ordered crystalline structure. By this definition, ice is a mineral but coal, opal and glass are technically mineraloids because they lack a fully ordered lattice or are organic.
Earth's internal heat flow averages only about 0.09 watts per square metre, thousands of times smaller than the roughly 340 watts per square metre of incoming solar radiation. Yet that small internal flux drives plate tectonics, because it operates continuously over billions of years across the whole mantle.
An ore deposit is a concentration of a mineral that can be extracted at a profit using current technology and prices. The same rock can be ore one decade and waste the next, because the cut-off grade depends on metal price, mining cost and processing technology, not only on geology.
An index fossil (or guide fossil) is a fossil of a species that was geographically widespread but existed for only a short interval of geological time, making it ideal for correlating and relatively dating the rock layers in which it occurs.
Module 6: Hazards
Risk is the expected harm from a hazard, often modelled as risk equals hazard multiplied by exposure multiplied by vulnerability. We can rarely reduce the hazard itself, but we can reduce exposure (where we build) and vulnerability (how we build and prepare), which is the core of hazard management.
Module 7: Climate Science
A carbon reservoir (or sink) is a store that holds carbon, such as the oceans, forests, soils or fossil-fuel deposits. A flux is the movement of carbon between reservoirs, such as photosynthesis or combustion. Climate stays steady when the fluxes into and out of the atmosphere are in balance.
Albedo is the fraction of incoming solar radiation that a surface reflects. Fresh snow and ice reflect most sunlight (high albedo, cooling); oceans and dark forests absorb most of it (low albedo, warming). Because ice has high albedo, melting ice lowers albedo and amplifies warming, the ice-albedo feedback.
Module 8: Resource Management
The environmental flow is the volume and timing of water deliberately left in or returned to a river to keep its ecosystem healthy. Setting environmental flows is the central tool for balancing human demand against environmental need, because rivers degrade if too much water is extracted for irrigation and towns.
The ecological footprint is the area of biologically productive land and water required to supply the resources a population consumes and to absorb its waste. When a population's footprint exceeds the biocapacity available to it, that consumption is unsustainable and draws down natural capital.