The Precambrian shield
A. is a complex of Precambrian metamorphic and plutonic rocks exposed over a large area
B. occurs only in mountainous regions
C. contains geologically young rocks
D. All of these choices are correct.
Answer: A
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What are some effects of building a dam?
A) A stream has more sediment below the dam and so can erode more efficiently. B) The reservoir (lake) traps sediment that over time fills up part of the reservoir. C) A dam, whether constructed by nature or by humans, represents a permanent change in base level. D) The stream erodes into the land instead of depositing sediment, where it enters the reservoir.
____________ is a systematic process of asking questions about the observable world by gathering and then studying
information (data). Fill in the blank(s) with the appropriate word(s).
The process in which a denser oceanic plate is forced deep below a lighter continental plate is known as ____________________
Fill in the blank(s) with correct word
The biosphere, the zone in which most life exists, is no more than _______ miles thicl.
Fill in the blank(s) with the appropriate word(s).