Characteristics of the atmosphere

The main gas in the atmosphere is:
1. Hydrogen
2. Oxygen
3. Water
4. Nitrogen
Which inner planets have atmosphere?
1. Mercury and Mars
2. Mars and the Earth
3. The Earth and Venus
4. Mercury and the Earth
The atmospheric pressure.
1. It is higher at the bottom of the atmosphere
2. It is lower at the top of the atmosphere
3. It is the same in any place in the atmosphere.
The Earth atmosphere is plenty of a gas which doesn't appear in other planets. Which gas is it?
1. Oxygen
2. Nitrogen
3. Carbon dioxide
4. Methane
Why our planet is rich in oxygen?
1. Because it is near the Sun.
2. Because of the plants.
3. Because it is far from the Sun.
4. Because of the volcanoes.