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8. It is the second highest layer of the Earth's atmosphere.
a Thermosphere
c. Stratosphere
b. Mesosphere
d. Troposphere
9. It contains about the 80 percent of the total mass of the atmosphere.
a. Thermosphere
c. Stratosphere
b. Mesosphere
d. Troposphere
10. The layer that lies after the lithosphere (100 km to 250 km) beneath km, Earth's surface
a Core
c. Crust
b. Asthenosphere
d. Mantle​