4. Which of the following processes produces oxygen? a) photosynthesis b) water

Question

4. Which of the following processes produces oxygen? a) photosynthesis b) water evaporation c) water vapor condensation d) lightning 5. What holds the Earth's atmosphere down? a) the vertical pressure gradient force b) the solar radiation c) the temperature lapse rate d) gravitation 6. Most of the Earth's atmosphere is found in the following layer: a) stratosphere b) troposphere c) exosphere d) thermosphere 7. As altitude increases in the Earth's atmosphere pressure and air density a) increase b) decrease c) stay the same d) none of the above

Explanation / Answer

4) Photosynthesis, Photosynthesis takes in the carbon dioxide produced by all breathing organisms and reintroduces oxygen into the atmosphere.

5)Graviation

6) Troposphere

7) decreases , as we elevate  Since most of the atmosphere's molecules are held close to the earth'ssurface by the force of gravity, air pressure decreases rapidly

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