Most of Earth's water is in the
A) oceans.
B) polar ice caps.
C) rivers, lakes, and stream.
D) ground.
Answer: A
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Given that organic molecules need to react in order to produce life, this suggests we should search for worlds in the solar system that have
A) either an atmosphere, or a surface or subsurface liquid medium such as water, or both. B) organic molecules on their surfaces C) an atmosphere D) rocky surfaces
The Sun remains stable because the inward pull of ______________ balances the outward push from nuclear fusion
Fill in the blank(s) with correct word
The supercontinent of Pangaea formed during the
A) Cenozoic. B) Paleozoic. C) Mesozoic. D) Precambrian.
What is the thermosphere?
A) the lowest layer in the atmosphere B) the part of the atmosphere that absorbs optical light C) the part of the atmosphere that absorbs ultraviolet D) the part of the atmosphere that absorbs X-rays E) the highest layer in the atmosphere