13. Which of the following correctly describes the stratosphere?
a. It has high concentration of ionized particles.
b. It is a layer extending to a height of about km.
c. It is a layer important to telecommunications.
d. It is an atmospheric ozone layer.
14. Why is the presence of ozone above the troposphere important for the
survival of living things on earth?
a. It helps in cloud formation.
b. It makes jet flying more comfortable.
c. It offers protection from the Sun's harmful UV rays.
d. It warms earth's surface
15. Why are scientists concerned about the greenhouse effect?
a. Human activities like burning of fossil fuels and deforestation enhance
the greenhouse effect.
b. Planting trees in wider areas is not possible; Earth has many desert areas.
c. There is no technology that will keep the temperature of Earth constant.
d. The human population is increasing rapidly; more carbon dioxide will be
released to the atmosphere.
16. What is the basis for the division of the layers of the atmosphere
surrounding Earth?
a. Changing amount of oxygen
b. Changing composition of gases.
c. Changing temperature.
d. Changing weather patterns.
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Answer:
d
Explanation:
The stratosphere is stratified (layered) in temperature, with warmer layers higher and cooler layers closer to the Earth; this increase of temperature with altitude is a result of the absorption of the Sun's ultraviolet radiation (shortened UV) by the ozone layer.