Carbon dioxide dissolves in the water in the Earth's oceans - Edexcel - GCSE Chemistry - Question 1 - 2017 - Paper 1
Question 1
Carbon dioxide dissolves in the water in the Earth's oceans.
(a) Describe how these oceans were originally formed.
(b) Some rocks are formed from dissolved carbon ... show full transcript
Worked Solution & Example Answer:Carbon dioxide dissolves in the water in the Earth's oceans - Edexcel - GCSE Chemistry - Question 1 - 2017 - Paper 1
Step 1
Describe how these oceans were originally formed.
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Answer
The Earth's oceans were originally formed from water vapor released from volcanic activity. As the Earth began to cool, this water vapor condensed into liquid water, leading to the formation of oceans.
Step 2
Describe how this happens.
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Answer
Rocks are formed from dissolved carbon dioxide when marine organisms or sea creatures absorb carbon dioxide from the water. This carbon dioxide can then combine with calcium ions to form calcium carbonate, which precipitates out of the water and accumulates as sedimentary rocks, such as limestone or chalk.
Step 3
Complete the sentence by putting a cross (✗) in the box next to your answer.
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