Composition and Evolution of Earths Atmosphere Flashcards Preview

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Flashcards in Composition and Evolution of Earths Atmosphere Deck (26):
1

How much nitrogen do we have in our atmosphere

80%

2

How much oxygen do we have in our atmosphere

20%

3

What do we have small proportions of in our atmosphere

Noble gases (argon)
Carbon dioxide
Water

4

How long ago do scientists believe our earth formed

4.6 billion years ago

5

What was the earth covered in for its first billion years and what were the conditions like

Hot and turbulent
Covered in volcanoes belching fire and gases into the atmosphere

6

What did the volcanoes release which formed our early atmosphere (3)

Carbon dioxide
Water
Nitrogen

7

In its first billion years What was our atmosphere the same as today

Mars and Venus'

8

What did the water vapour in our atmosphere do and form

Condensed forming oceans

9

How was lots of carbon dioxide removed from our early atmosphere

It dissolved in the oceans

10

What would the dissolved CO2 react to have formed in our early atmosphere

Carbon precipitates forming sediments in the seabed

11

What was there also traces of that is believed to have formed the first organic molecules

Methane and ammonia

12

What did the first organic molecules lead to

The first living organisms

13

What evolved and absorbed some CO2

Green plants for photosynthesis

14

When marine animals evolved after green plants what did their shells and skeletons contain

Carbonates from the oceans

15

How did oxygen increase in our original atmosphere

When the first living things (green plants) used CO2 and sunlight for photosynthesis , oxygen was produced and glucose

16

What started the photosynthesis process before green plants evolved

Algae

17

What enabled animals to evolve

The oxygen increasing

18

What's the equation for photosynthesis

Carbon dioxide + water --> oxygen + glucose

19

Where did some of the carbon that marine animals took in become locked up in when they died

Rocks and fossil fuels

20

What are the rocks containing carbon

Limestone

21

What are the fossil fuels

Crude oil, natural gas

22

What are crude oil and natural gas formed from the deposits of

Plankton

23

What's coal

Sedimentary rock made from thick plant deposits

24

What's limestone

Sedimentary rock made of calcium carbonate deposits from shells and skeletons of marine organisms

25

How was the fossil fuel coal formed

When plants like trees died they became compressed over millions of years forming coal

26

What did plants use the glucose made in photosynthesis for

Making starch, cellulose and wood