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1. The ozone layer is contained within the___________

a) Troposphere
b) Stratosphere
c) Mesosphere
d) Thermosphere

SAI INTERNATIONAL SCHOOL
SUBJECT – GEOGRAPHY STD VII
TOPIC- LESSON -4 AIR
SUB TOPIC- Structure of atmosphere

HOME ASSIGNMENT
OBJECTIVE-
2. Which of the following contains roughly 80% of the Earth’s atmosphere?

a) Troposphere
b) Stratosphere
c) Mesosphere
d) Thermosphere

3. Which of the following are parts of an atmosphere?

a) b and c both
b) Stratosphere
c) Thermosphere
d) Hydrosphere

4. CFC" is continuously destroying the ____ layer:
a) D-layer
b) Ozone layer
c) F-layer
d) Y –layer

5. The average height of troposphere from surface is ______ km:
a) 11km
b) 25 km
c) 56km
d) 112km

6. Which layer of the atmosphere is responsible for aurora formation?

a) A Ozone layer
b) B Stratosphere
c) C Exosphere
d) D Ionosphere