Topic 4: Unit-2

Question 1

What is the troposphere?

Answer 1

The lowest layer of the atmosphere, where weather occurs and life exists.

Question 2

How high does the troposphere extend?

Answer 2

Up to around 10 km above sea level

Question 3

Troposphere air density?

Answer 3

It has the greatest density as the air particles are very close together

Question 3

Why is the troposphere important?

Answer 3

It contains most of the air we breathe (water vapour), clouds, and weather systems, making it vital for life on Earth.

Question 3

What happens to air density and atmospheric pressure in the troposphere?

Answer 3

Both air density and pressure decrease as you go up in the troposphere because there are fewer air molecules at higher altitudes.

Question 3

What is the tropopause?

Answer 3

The boundary between the troposphere and the stratosphere, where the temperature stops decreasing and remains constant.

Question 4

How does temperature change in the troposphere?

Answer 4

Temperature decreases with altitude at an average rate of 6.5°C per km as you go higher.

Question 5

Weather patterns form in this layer:

Answer 5

• more direct sunlight at the equator creates a warmer atmosphere
• air warmed at the equator rises to higher altitudes
• warm air at high altitudes moves towards the colder N/S poles where it cools
• cooled air sinks at the poles towards the earth’s surface where it gradually warms as it moves back towards the equator