The Atmosphere - Quiz -

1. About 4 billion years ago, the Earth's primative atmosphere
       was formed from

a) Trees

b) Mountains

c) Power stations

d) Volcanoes


2. About 2 billion years ago, the first green plants reduced the amount
     of carbon dioxide in the atmosphere and replaced it with

a) Hydrogen

b) Nitrogen

c) Oxygen

d) Argon


3. Ozone is formed high up in the atmosphere
     when ultraviolet light interacts with

a) Oxygen

b) Nitrogen

c) Water

d) The sky


4. A hole in the ozone layer increases the risk of

a) Global warming

b) Global freezing

c) Skin cancer

d) Chicken pox


5. The percentages of the gases in the atmosphere today are

a) 10% Nitrogen, 50% Oxygen, 40% Carbon Dioxide

b) 20% Nitrogen, 70% Oxygen, 10% Carbon Dioxide

c) 58% Nitrogen, 31% Oxygen, 11% Argon

d) 78% Nitrogen, 21% Oxygen, 1% Argon


6. Nitrogen is used

a) As a catalyst

b) To make fertilisers

c) To conduct electricity

d) To make unidirectional electric motors


7. Oxygen is used

a) To make breathing equipment

b) In fire extinguishers

c) In airships

d) To make salt


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