The Atmosphere

The Earth’s early atmosphere was mainly due to:

• Waterfalls

• Volcanic activity

• Meteors

• Earthquakes

Select the true statements from the list below.

• The early atmosphere probably contained little or no oxygen.

• The early atmosphere contained a high proportion of oxygen.

• The early atmosphere probably contained a large amount of carbon dioxide.

• The early atmosphere probably contained a small amount of carbon dioxide.

What is the proportion of nitrogen in the modern atmosphere?

• 21%

• 0.04%

• 78%

• 0.9%

As the Earth cooled, water vapour condensed to form the oceans.

• True

• False

The amount of carbon dioxide in the atmosphere decreased due to ...

• ... it forming carbon dioxide

• ... it becoming carbonate in rocks.

• ... it dissolving in the oceans.

• ... it splitting up into carbon and oxygen.

Select the correct equation for photosynthesis.

• $C_6H_{12}O_6\ \rightarrow\ 2C_3H_6O_3$

• $C_6H_{12}O_{6\ }+6O_2\ \rightarrow\ 6CO_2\ +6H_2O$

• $C_6H_{12}O_6\ \rightarrow\ 6CO_2\ +\ 6H_2O$

• $C_6H_{12}O_6\ +O_2\ \rightarrow\ C_3H_6O_3\ +3H_2O\ +3CO_2$

Photosynthesis changed the atmosphere as:

• It increased the concentration of carbon dioxide in the atmosphere.

• It decreased the concentration of carbon dioxide in the atmosphere.

• It increased the concentration of oxygen in the atmosphere.

• It decreased the concentration of oxygen in the atmosphere.

What is the test for oxygen?

• Hold splint to test tube.

• Hold glowing splint to test tube and see if it relights.

• Hold lit splint to test tube and see if there is a squeaky pop.

• Hold lit splint to test tube and see if it goes out.

Select the greenhouse gases from the list below.

• Methane

• Carbon dioxide

• Oxygen

• Water vapour

Which of these effects on the planet is not associated with burning fossil fuels?

• Global warming

• An increase in the amount of oxygen in the oceans.

• An increase in the amount of carbon dioxide in the atmosphere.