Inside a greenhouse, the air temperature is (less/more) than it is outside.

The underlined word in each sentence is incorrect. Write the correct word.

1. In the atmosphere, the density of air increases with increase in height.
2. All weather phenomena occurs in the stratosphere.
3. A greenhouse is a brick house used to grow plants in cold areas.
4. A rise in sea level due to global warming will cause flooding of mountainous areas.
5. Light year is used to measure the thickness of ozone layer.

What is the lower part of the thermosphere called?

1. troposphere
2. ionosphere
3. exosphere
4. mesosphere

Which of these is a greenhouse gas?

1. carbon dioxide
2. oxygen
3. hydrogen
4. nitrogen