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9.1 The composition and evolution of the Earth's atmosphere

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Question 8
F

Coal was formed from thick deposits of plant material. Which condition allowed the plant material to form coal instead of decaying away?

[1]
A

A steady supply of oxygen from the atmosphere

B

An absence of oxygen in the sediments above it

C

A high concentration of dissolved carbonates

D

A low temperature at the bottom of the ocean

Markscheme

9.1 The composition and evolution of the Earth's atmosphere Questions

  1. GCSE
  2. /Chemistry
  3. /9.1 The composition and evolution of the Earth's atmosphere

40 exam-style questions on AQA GCSE Chemistry 9.1 The composition and evolution of the Earth's atmosphere, covering 9.1.1 The proportions of different gases in the atmosphere, 9.1.2 The Earth's early atmosphere, 9.1.3 How oxygen increased, and 9.1.4 How carbon dioxide decreased. Each one has a worked solution and a mark scheme showing where the marks go.

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