Version 2.0 Copyright © AQA and its licensors. All rights reserved. C1.7.2 The Earth’s Atmosphere.

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C1.7.2 The Earth’s Atmosphere

Using Exam pro items to support successful outcomes

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• Learners will be able to test their progress against learning outcomes using questions from past AQA GCSE examinations

Foundation Tier ( C1 Jun 12 , 2.)

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Mark scheme- Foundation

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Q Answer Extra Information Mark (a) A- core

B- mantleC- crust

111

(b) Any 2 from:•Carbon dioxide dissolves / absorbs in water / oceans•Plants/ algae photosynthesise / absorb/ use carbon dioxide

•Marine organisms use ( dissolved) carbon dioxide to form their shells / skeletonsOr limestone was formed from shells / skeletons of marine organisms

allow reacts with water

Accept remains in plants / algae / marine organisms contain locked up carbon dioxide / carbon in the form of fossil fuelsDo not accept plants use carbon dioxide for respirationAccept carbon dioxide becomes locked up in sedimentary rocks / carbonates / limestone

Precipitation or formation of insoluble carbonates

2

Total 5

Higher Tier ( C1 Jun 12 , 4.)

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Use the information on the last two slides to answer these questions

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Mark scheme- Higher

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Q Answer Extra Information Mark

(a) Any 2 from:•Carbon dioxide dissolves in water / oceans•Marine organisms use ( dissolved) carbon dioxide to form their shells / skeletonsOr limestone was formed from the shells / skeleton of marine organisms•Plants ;/ algae photosynthesise / absorb / use carbon dioxide

Accept carbon dioxide becomes locked up in sedimentary rocks / carbonates/ limestoneOrPrecipitation or formation of insoluble carbonatesAccept remains of plants / algae / marine organisms contain locked up carbon dioxide / carbon in the form of fossil fuelsDo not accept plants use carbon dioxide for respiration

2

(b)(i) Because these gases / molecules contain the elements / atoms in amino acidsOr the gases / they contain carbon, hydrogen and nitrogen

Ignore oxygen

1

Mark scheme- Higher

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Q Answer Extra Information Mark

(b)(ii)

Any 2 from•Nobody knows what was in the Earth's early atmosphere

•There may not have been ( continuous) lightning•Miller and Urey selected only the gases needed to produce amino acids

Ignore small scale / timescaleIgnore references to water / oceans or other theories

Accept these gases / hydrogen / methane/ ammonia may not have been in the Earth's early atmosphereAccept carbon dioxide / nitrogen may have been in the Earth's early atmosphereAccept reference to Venus’ present atmosphere

2

Total 5