What is the smallest form of plankton?
A) Microplankton
B) Nanoplankton
C) Femtoplankton
D) Picoplankton
C
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A cloud of interstellar gas is held together by
A. the gravitational force. B. electromagnetism. C. infrared radiation. D. All of the above.
Which principle of relative age dating is important for determining the relative age of igneous rock that has intruded into overlying rock?
The recovery of acidic lakes in the northeastern United States and eastern Canada is largely the result of
A) the buffering effects of the granite rock in these regions. B) the widespread addition of limestone to the lakes in these regions. C) the elimination of lead from gasoline sold in North America. D) reductions in sulfur dioxide and nitrogen oxide pollution.
A barrier island is typically separated from the mainland by a(n) ________.
A. fjord B. delta C. estuary D. lagoon E. surf zone