1. The gas that exist in the atmosphere is due to
a. Oxygen
c. water vapor
b. Hydrogen
d. carbon dioxide
2. The presence of oxygen in the early atmosphere is due to
a. Lighting
c. volcanic eruption
b. earthquake
d. splitting of water by ultraviolet radiation
3. The following are the sources of oxygen in the atmosphere except
a. Ammonia
d. sulfates
b. Ozone
c. water
4. Which ocean zone is called the deep sea?
a. Abyssopelagic
c. Epipelagic
b. Bathypelagic
d. Mesopelagic
5. Which zone has plants?
a. Abyssopelagic
c. Epipelagic
b. Bathypelagic
d. Mesopelagic
6. The third layer of the atmosphere is the
a. Thermosphere
c. Stratosphere
b. Mesosphere
d. Troposphere
7. Above the tropopause is the
a. Thermosphere
e. Stratosphere
b. Mesosphere
d. Troposphere​