✒️SCIENCE

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✒️GREENHOUSE GAS

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7. D

8. C

9. A

10. D

7. Why are scientist concerned about greenhouse effect?

• There is no technology that will keep the temperature of earth constant.
• b. Planting trees in wider areas is not possible.
• c. Human activities like burning of fossil fuels and deforestation enhance the green effect.
• ✒️d. The human population is increasing rapidly, more carbon dioxide will be released to the atmosphere.

D. The human population is increasing rapidly, more carbon dioxide will be released to the atmosphere.

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greenhouse gas that worries climate scientist is carbon dioxide And that's got scientists concerned about accelerated global warming.

8. Which human activities contribute to global warming?

• a. Planting trees
• b. Burning of fossil fuels
• c. Reforestation
• d. Recycling

B. ✒️ Reforestation

9. Which of the following correctly describes the stratosphere?

• a. It is atmospheric ozone layer.
• c. it has high concentration of carbon dioxide.
• d. It is extending 5 km above the surface.
• b. It is closer the earths surface.

A. It is an atmospheric ozone layer

Stratosphere is the second layer of atmosphere above the troposphere and below the mesosphere. Temperature increases as altitude increases in this layer because of ozone layer present. Lower stratosphere is cooler compared to upper stratosphere.

10. In which layer do virtually all-weather phenomena take place?

• a. Exosphere
• b. Mesosphere
• c. Stratosphere
• d. Troposphere.

✒️D. The Troposphere

The troposphere is the lowest layer of Earth's atmosphere. Most of the mass (about 75-80%) of the atmosphere is in the troposphere. Most types of clouds are found in the troposphere, and almost all weather occurs within this layer.

Explanation:

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