CC17 Earth and the Atmosphere Flashcards

1
Q

How can oxygen be tested for?

A

Relights a glowing splint

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2
Q

What gases made up the Earths initial atmosphere

A

Large amount of carbon dioxide, water vapour, small amounts of other gases

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3
Q

What happened to the water vapour as the earth cooled?

A

Water vapour condensed forming oceans

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4
Q

What affect did the formation of the oceans have on the amount of carbon dioxide in the atmosphere?

A

Carbon dioxide dissolves in water so some dissolved and the amount in the atmosphere decreased

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5
Q

How did the growth of primitive plant affect the atmosphere?

A

They used carbon dioxide and released oxygen in photosynthesis

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6
Q

What is the composition of our atmosphere today?

A

Nitrogen about 78%, Oxygen 21%, 1% other gases

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7
Q

Name 3 greenhouse gases

A

Carbon dioxide, methane and water vapour

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8
Q

What is the greenhouse effect

A

Greenhouse gases absorb heat radiated from the earth and release it keeping the earth warm

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9
Q

Name 2 effects of global warming

A

Polar ice caps melting, sea levels rising

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10
Q

Where did the gases that fomed our early atmosphere come from?

A

They were produced by volcanic activity.

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11
Q

What gas, in today’s atmosphere was missing from our early atmosphere?

A

oxygen

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12
Q

What does correlation mean?

A

There is a link between them. (eg. As one increases so does the other)

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13
Q

When did oxygen begin to be formed in our atmosphere?

A

When the first plants began photosynthesising

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14
Q

What do greenhouse gases do?

A

Trap heat in our atmosphere

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15
Q

Name one man made cause of the greenhouse effect

A

Deforestation

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16
Q

What has happened to the amount of carbon dioxide in our atmosphere in the last 200 years?

A

It has increased

17
Q

What human activityhas increased the amount of carbon dioxide in our atmosphere?

A

Burning fossil fuels

18
Q

What human activity, other than burning fossil fuels, might have increased the amount of carbon dioxide in our atmosphere?

A

Respiration (as population increases so does this)

19
Q

If a sample of the atmosphere is reaccted with copper, what gas will react?

20
Q

If all the oxygen is removed from a sample of the atmosphere how much is removed?