The Earth’s earliest atmosphere was very different from the Earth’s atmosphere today - Edexcel - GCSE Chemistry - Question 1 - 2014 - Paper 1
Question 1
The Earth’s earliest atmosphere was very different from the Earth’s atmosphere today.
Complete the sentence by putting a cross (✗) in the box next to your answer.
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Worked Solution & Example Answer:The Earth’s earliest atmosphere was very different from the Earth’s atmosphere today - Edexcel - GCSE Chemistry - Question 1 - 2014 - Paper 1
Step 1
Complete the sentence by putting a cross (✗) in the box next to your answer.
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Answer
The Earth’s earliest atmosphere was formed by D volcanic activity.
Step 2
(i) The Earth’s earliest atmosphere is thought to have contained mainly
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Answer
carbon dioxide.
Step 3
(ii) Over the years, carbon dioxide dissolved in the oceans and was absorbed by marine organisms.
The marine organisms eventually formed rocks which are
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Answer
carbonates.
Step 4
(iii) The Earth’s atmosphere today contains approximately 79% of
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