Case study·Hard exam skill (4/5)·No calculator
Difficulty guide
The label describes the problem, not your ability.
1/5 - Foundational
Warm-up setup; checks one basic idea.
2/5 - Routine exam skill
Normal syllabus skill; usually one main rule or interpretation.
3/5 - Standard multi-step
Exam-style problem with multiple steps or a common trap.
4/5 - Hard exam skill
High-end exam problem; combines methods carefully.
5/5 - Challenge
Stretch problem beyond normal exam pressure.
Question
A hillside has trees, thin soil and a stream below it. After many trees are cut, more rainwater runs downhill and the stream becomes muddy.
Total: 4 marks
(a) Which sphere changed first? (1 mark)
(b) Which sphere is represented by the muddy stream? (1 mark)
(c) Why did soil loss increase? (1 mark)
(d) Suggest one preventive action. (1 mark)
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