1. Why is the atmosphere essential for the survival of organisms? (Pg. 2) Page 64
2. Describe the role of water vapour in the atmosphere. (Pg. 2) Page 64
3. What are the sources of dust particles found in the atmosphere? (Pg. 3) Page 65
4. Why is the thickness of the troposphere greatest at the equator? (Pg. 3) Page 65
5. What is the key feature of the stratosphere and why is it important for life on Earth? (Pg. 3) Page 65
6. List the main elements of weather and climate. (Pg. 4) Page 66

Which gas is meteorologically important because it is transparent to incoming solar radiation but opaque to outgoing terrestrial radiation? (Pg. 2)

Where is the concentration of water vapour in the air typically the highest? (Pg. 2)

In which regions is the concentration of dust particles generally higher? (Pg. 3)

What is the rate of temperature decrease (lapse rate) within the troposphere? (Pg. 3)

Which layer of the atmosphere contains electrically charged particles (ions) that reflect radio waves? (Pg. 3)

(Exercise) Which one of the following gases constitutes the major portion of the atmosphere? (Pg. 4)

(Exercise) Atmospheric layer important for human beings is: (Pg. 4)

(Exercise) Sea salt, pollen, ash, smoke soot, fine soil are associated with: (Pg. 4)

(Exercise) Oxygen gas is in negligible quantity at the height of: (Pg. 4)

(Exercise) Which gas is transparent to incoming solar radiation and opaque to outgoing terrestrial radiation? (Pg. 4)

The ozone layer, found between 10 and 50 km, absorbs ______ rays from the sun. (Pg. 2) Page 64

Dust and salt particles act as ______ nuclei for water vapour condensation. (Pg. 3) Page 65

The lowermost layer of the atmosphere, where all weather phenomena occur, is the ______. (Pg. 3) Page 65

The zone separating the troposphere from the stratosphere is called the ______. (Pg. 3) Page 65

The layer above the thermosphere that gradually merges with outer space is the ______. (Pg. 4) Page 66