Earth and Space Science
Earth and Space Science pulls the ground under your feet and the planets beyond into one running story: change driven by energy. Examiners love catching students who mix up weathering with erosion, get an eclipse alignment backwards, or blame the seasons on Earth being 'closer to the Sun' — every one of those is a specific, avoidable mark loss. Six ideas, one theme: rock is built and destroyed, seasons cycle, moons and shadows line up (occasionally) — because the Sun keeps supplying energy and gravity keeps everything in motion.
Overview — The Shape of This Topic
This topic covers processes at two very different scales: the slow destruction and rebuilding of rock on Earth's surface (weathering, erosion, the rock cycle), and the much larger motions of Earth, Moon and Sun that give us day/night patterns, seasons, phases and eclipses. Underneath it all sits Earth's own internal structure — the layered interior whose heat drives everything from volcanoes to the magnetic field.
- Surface processes (weathering, erosion, rock cycle) are powered mainly by the Sun's energy and gravity acting on water, ice and wind.
- Astronomical processes (phases, eclipses, seasons) are all about geometry — the relative POSITIONS of Sun, Earth and Moon, not their temperature or distance.
- Earth's internal structure explains why the surface is dynamic at all: heat escaping from the interior drives the slow movements that eventually recycle rock.
The shape of the chapter
Command terms this topic tests hardest
| Command term | What it demands | AO | Mark-earning move |
|---|---|---|---|
| Define | state the precise accepted meaning of a term | AO1 | 1 mark for the exact accepted definition — a vague paraphrase loses the mark |
| Describe | state the relevant features or steps of a process/observation | AO1/AO2 | marks awarded per correct feature/step named — no reasoning required, just accurate detail |
| Explain | give the reason or mechanism behind why/how something happens | AO2 | marks reserved for the causal link (the WHY) — restating what happens without the mechanism scores lower |
| Identify | name or select the correct item from given information | AO1 | 1 mark for the correct name/label, no justification unless separately asked |
| Calculate | use given data to work out a numerical answer with correct units | AO2/AO3 | marks for correct method, correct substitution, AND correct units — dropping units can cost the final mark |
| Compare | give explicit similarities and/or differences between two or more things | AO2 | requires a direct link between the two things — two separate descriptions placed side by side earns no comparison mark |
Key point
Overview