The history of the earth

Question 1

What percent of the atmosphere is nitrogen?

Answer 1

78%

Question 2

What percent of the the atmosphere is oxygen?

Answer 2

21%

Question 3

What gases did volcanoes in the early days of the earth release?

Answer 3

Water Vapour, Carbon Dioxide and Nitrogen

Question 4

How were the oceans formed?

Answer 4

Water vapour condensing into water

Question 5

How was the oxygen in the earth’s atmosphere formed?

Answer 5

Lots of plants and green algae used the CO(2) and water vapour to make glucose and oxygen through photosynthesis

Question 6

What did the excess oxygen in the atmosphere create?

Answer 6

The ozone layer

Question 7

How does the greenhouse effect work?

Answer 7

When electromagnetic waves from the sun enter the atmosphere the short wavelength radiation e.g. X-rays are absorbed
The long wavelength radiation e.g infrared is reflected of the earth and into space
Some of the infrared radiation is absorbed by the greenhouse gasses and the atmosphere warms up