The Earth's atmosphere is a mixture of gases, mostly nitrogen and hydrogen.
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Q36: A tectonic plate is composed of:
A) cool,
Q37: The crust is about:
A) 5-10 km thick.
B)
Q38: Earth's crust is part of the:
A) hydrosphere.
B)
Q39: Ground water saturating rock underground is a
Q40: The fundamental source of energy that drives
Q42: The Earth's atmosphere acts as a blanket,
Q43: All of Earth's spheres continuously exchange matter
Q44: A giant meteorite smashing into Earth is
Q45: The hydrosphere includes water in streams, lakes,
Q46: Ground water accounts for 71 percent of
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