The Atmosphere

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The Water Cycle
1 How does Water Vapour get into the Air? Give two sources. Answer
2 What is Precipitation in the Water Cycle? Answer
3 Why is the Sea Salty? Answer
4 Give one process which remove Salt from the Sea. Answer


The Carbon Cycle
5 Give two process which release Carbon Dioxide into the Atmosphere. Answer
6 Give one process which removes Carbon Dioxide from the Atmosphere. Answer
7 Does Carbon Dioxide dissolve in Rain Water? Answer
8 How can Limestone release Carbon Dioxide into the Atmosphere? Answer


The Nitrogen Cycle
9 What is Fixing? Answer
10 Why do Plants need Nitrogen? Answer
11 What type of bacteria turn Nitrite into Nitrate in the Soil? Answer
12 What type of bacteria turn Nitrate in the Soil into Nitrogen in the Atmosphere? Answer


The Early Atmosphere
13 Name two Gases which were present in the Earth's early Atmosphere? Answer
14 Where did the Gases in the Earth's early Atmosphere come from? Answer
15 Where did the Oceans come from? Answer
16 What were the First Life Forms? Answer
17 Which Gas do Green Plants add to the Atmosphere? Answer
18 Where did Nitrogen in the Earth's Atmosphere come from? Answer


The Atmosphere Today
19 How is Ozone Produced high up in the Atmosphere? Answer
20 How does the Ozone Layer Protect our planet? Answer
21 Name one Chemical which can produce a hole in the Ozone Layer? Answer
22 Give one risk of having a hole in the Ozone Layer. Answer
23 What is the Proportion of Nitrogen in the Atmosphere Today? Answer
24 What is the Proportion of Oxygen in the Atmosphere Today? Answer
25 What is the Proportion of Argon in the Atmosphere Today? Answer
26 Which Experiment can show the Proportion of Oxygen in the Air Today? Answer
27 Give one Use of Nitrogen. Answer
28 Give one Use of Oxygen. Answer
29 Give one Use of Argon. Answer