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What sphere refers to water and ice?
a. atmosphere
b. hydrosphere
c. lithosphere
d. biosphere

Earth's outermost sphere is called the
a. biosphere.
b. atmosphere.
c. lithosphere.
d. hydrosphere.

What part of Earth contains rocks?
a. Biosphere
b. Hydrosphere
c. Atmosphere
d. Lithosphere

What of Earth's spheres is composed of a mixture of gases?
a. mesosphere
b. hydrosphere
c. atmosphere
d. biosphere

What is Earth's hydrosphere?
a. the gases in the air
b. the solid, rocky part of Earth
c. all of the water on the planet
d. the study of Earth's atmosphere​