Question

q.3. write t or true if the statement is true; write f or false if the statement is false. 1. the greenhouse effect is a natural process that supports life on the earth for millions of years. 2. the majority of the earths atmosphere is composed of nitrogen and oxygen, greenhouse gases comprise only a tiny fraction of the atmosphere. 3. all greenhouse gases are created as a result of human activity. q.4. which of the following is a greenhouse gas? a) oxygen b) ozone c) nitrogen d) carbon dioxide

Explanation:

1. The greenhouse effect is a natural process that warms the Earth's surface and supports life, so the first statement is True.
2. The Earth's atmosphere is mainly composed of nitrogen and oxygen, and greenhouse gases are a small fraction of the atmosphere, so the second statement is True.
3. Some greenhouse gases like carbon - dioxide have natural sources as well as human - induced sources, not all are created as a result of human activity, so the third statement is False.
4. Oxygen and nitrogen are not greenhouse gases, while ozone and carbon dioxide are greenhouse gases.

Answer:

Q.3. T
Q.4. b) Ozone, d) Carbon Dioxide