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