C9

Question 1

What are the gasese in our atmosphere how much of each of them were there?

Answer 1

Other gases in small amount e.g. Carbon dioxide, water vapour, noble gases

Question 2

Why can’t scientist be certain about the earth early atmosphere?

Answer 2

Earth is about 4 billion years old= can be certain

Question 3

WHat was the early earth’s atmosphere like ?

Answer 3

Early atmosphere like Mars+Venus today

Question 4

How was the early earth atmosphere formed?

Answer 4

1. Intense volcanic activity (volcanes cover the earth) =released gases wich form the atmosphere:
   ->water vapour
   ->nitrogen
   ->small amount of ammonia+ methane,
   ->LOADS of CARBON DIOXIDE
2. As the earth cooled the water vapour condensed to form oceans