Post Assessment
Directions: Encircle the letter of the best answer:
1. Which layer of the atmosphere does the air constantly moving?
A. mesosphere
B. thermosphere C. exosphere
D. troposphere
2. What is the role of the ozone layer in the atmosphere?
A. It burns meteors and other rock fragments.
B. It gives off energy to the Earth and other heavenly bodies.
C. It allows the Sun's harmful radiation from entering the Earth's surface.
D. It acts as a protection of the Earth by absorbing the Sun's harmful radiation.
3. Which layer does merge into space?
A. stratosphere
B. exosphere
C. mesosphere
D. thermosphere
4. Where do meteors burn in the atmosphere?
A. thermosphere B. Troposphere
C. mesosphere
D. exosphere
5. How many percent of oxygen does the atmosphere contains?
A. 78 %
B. 60%
C. 25%
D.21%
6. Which layer of the atmosphere has very thin and cold air?
A. mesosphere
B. thermosphere C. exosphere
D. troposphere
7. What do you mean by trace gases?
A. They are not harmful
C. They are emitted by trees
B. They are naturally occurring on Earth D. They are present in very small amounts.
8. Where can we find Auroras?
A. stratosphere
B. exosphere
C. mesosphere
D. thermosphere
9. Which layer does the airplane experience "turbulence"?
A. thermosphere B. troposphere
C. mesosphere
D. exosphere
10. How many percent of trace gases does the atmosphere contains?
B. 6 %
A. 78 %
D. 21%
C.1%
11. The following are the common sources of methane, EXCEPT:​