The Earth's Atmosphere

Question 1

Approximately how long ago did earth form

Answer 1

Approximately 4.6 billion years ago

Question 2

What is the main theory of where the atmosphere came from

Answer 2

the early atmosphere supposedly came from intensive volcanic activity which released gases that made the early atmosphere very similar to the atmosphere of Mars and Venus today

Question 3

What are the characteristics of the atmospheres of earth Mars and Venus

Answer 3

A large amount of carbon dioxide little or no oxygen and small amounts of other gases such as ammonia and methane

Question 4

What else did the volcanic activity also release that formed the oceans

Answer 4

water vapour

Question 5

What are the percentages of gas in the atmosphere

Answer 5

80% nitrogen 20% oxygenand there is a very small amount of the gases including carbon dioxide and water vapour and noble gases

Question 6

How does oxygen increase in the atmosphere

Answer 6

Plants make their own food by photosynthesis in this process carbon dioxide is reacted with the water to produce glucose with oxygen as a by-product

Question 7

What does scientists think evolved approximately 2.7 billion years ago to help form oxygen

Answer 7

Algae

Question 8

Carbon dioxide is a very____gas it dissolves readily in ______

Answer 8

Soluble and water

Question 9

Crude oil and natural gas with formed from

Answer 9

simple plant and tiny animals which were living in oceans and lakes the small organisms that died in their remains sank to the bottom where they were buried under settlements the lack of oxygenpreventing oxidation from occurring over millions of years heat and pressure to the remains of the organisms into crude oil