Atmosphere Earth

Question 1

What is phase 1

Answer 1

volcanoes give out CO2 and Water vapour

Question 2

what is phase 2

Answer 2

green plants evolved and Oxygen is produced

Question 3

what is phase 3

Answer 3

ozone layer

Question 4

now explain the atmosphere evolution

Answer 4

• earth was molten volcanoes occurring releasing CO2 steam methane
• mostly CO2 and Water Vapour
• water vapour condensed into oceans

Question 5

explain fully phase 2

Answer 5

CO2 dissolved into oceans

N2 formed from ammonia and oxygen and denitrifying bacteria

and green plants formed which remove co2 and produce o2

o2 increases

Question 6

explain phase 3 fully

Answer 6

build up of o2 caused organisms death allowing evolution of complex organisms

ozone layer created block harmful layers of sun rays so survival

No CO2 left

Question 7

how did CO2 decrease

Answer 7

water soluble gas, water vapour in Earth’s early atmosphere condensed large amounts of CO2 dissolved in the oceans

Carbonates were precipitated during this process

sea creatures began to appear which used up the carbonates to form shells and skeletons

Green plants and algae began to evolve, absorbed considerable amounts of carbon dioxide during photosynthesis

Question 8

test for oxygen

Answer 8

glowing splint inside a test tube of gas

If the gas is oxygen the splint will relight

Question 9

what is the greenhouse effect

Answer 9

• sun gives out electromagnetic radiation
• energy absorbed by greenhouse effect and some re-emmited back greenhouse gases
• some re-emited back into space
• absorption and re-emissions by greenhouses gases keep warm

Question 10

what is enhanced greenhouse effect

Answer 10

• if concentration of greenhouse gases increases enhanced greenhouse effect.

heat radiation from earth is absorbed and re-emitted causes atmosphere to heat up

Question 11

why is methane gas an issue

Answer 11

as concentration increases due to human activity such a livestock
increasing amounts is very significant greenhouse gas causing temperature increase ] global warming

Question 12

how is historical data less accurate than current records

Answer 12

• taken over fewer locations fewer methods may be no methods at all if you go far enough
• you can estimate past data buy analysing ice sheets fossils // less precise

Question 13

how can we reduce carbon dioxide emissions

Answer 13

cut down greenhouse gases or limit fossil fuels walk instead of driving