Our changing planet

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  • Created by: Sam Evans
  • Created on: 22-05-14 19:02
Name the main parts of the Earth
Core, mantle, crust and atmosphere
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Why should we be careful not to waste the Earth's resources?
Because the resources are limited
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Name three gases that scientists think were in the Earth's early atmosphere
Ammonia, methane and hydrogen
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Name four gases that are now in the atmosphere
Nitrogen, oxygen, carbon dioxide and argon
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How did oceans form?
When the Earth cooled down the water vapour in the atmosphere condensed
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What was the effects of algae and plants on the early atmosphere
The removed carbon dioxide and replaced it with oxygen
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What are tectonic plates?
Large pieces of the Earths crust
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Why do tectonic plates move?
They move because of convection currents in the mantle
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About how much do tectonic plates move in a year?
A few centimetres
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What happens at plate boundaries?
Earthquakes and volcanic eruptions occur and mountains form
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Why have the amounts of gases in the atmosphere been almost the same for the last 200 million years?
Natural processes maintain a balance from the carbon moving in and out o the atmosphere due to plants, animals, oceans and rocks
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What has been the main cause of a change in the amount of gases in recent years?
Burning fossil fuels
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Why were Wegener's ideas not accepted until the 1960's?
Because the he could not prove that the continents moved until the 1960's when new evidence was discovered
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Why are there so many theories about how life began?
There is insufficient evidence and there are many possibilities but no proof
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Outline the Miller and Urey experiment
They used a mixture of water, ammonia, methane and hydrogen and used a small electric spark to timulate lightning which produced amino acids from which proteins are made
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What is meant by primordial soup?
A mixture of organic amino acids needed for life in water
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Why is the fractional distillation of liquid air done commercially?
To separate the air into individual gases, to produce nitrogen and oxygen, which are raw materials
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Explain briefly how the fractional distillation of liquid air is done
Air is cooled until it becomes liquid which is then put into a fractionating column. Nitrogen is collected as a gas at the top of the column and oxygen remains as a liquid and is colelcted at the bottom
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Other cards in this set

Card 2

Front

Why should we be careful not to waste the Earth's resources?

Back

Because the resources are limited

Card 3

Front

Name three gases that scientists think were in the Earth's early atmosphere

Back

Preview of the front of card 3

Card 4

Front

Name four gases that are now in the atmosphere

Back

Preview of the front of card 4

Card 5

Front

How did oceans form?

Back

Preview of the front of card 5
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