In science, a theory is

A. unchangeable.
B. an opinion.
C. a synthesis of a large body of well-tested knowledge.
D. an educated guess.


Answer: C

Environmental & Atmospheric Sciences

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One advantage of large-scale hydropower is that it

A. does not require government subsidies. B. has a high net energy yield. C. produces low methane emissions. D. makes it easier for fish to migrate upstream. E. does not alter aquatic ecosystems.

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When a piece of iron is heated, molecules inside move faster and occupy more space, which results in thermal

A. heat. B. contraction. C. bending. D. expansion.

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_____ an elongated ridge of sand that projects from the land into the mouth of an adjacent bay

Fill in the blank(s) with the appropriate word(s).

Environmental & Atmospheric Sciences

A proposed explanation for an observed natural phenomena is a(n) ____________________. Fill in the blank(s) with the appropriate word(s)

Environmental & Atmospheric Sciences