During a glacial period, ice contains ____ than seawater, while seawater has ____ than ice
a. less oxygen 16; more oxygen 16
b. more oxygen 16; more oxygen 18
c. less oxygen 16; less oxygen 18
d. more oxygen 18; less oxygen 18
e. more oxygen 18, more oxygen 16
b
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Plankton are small animals and plants that float passively in the marine environment
a. True b. False
Heavy metals ________
A) are not harmful unless they are directly ingested B) become less hazardous after incineration C) are unregulated by the U.S. government D) bioaccumulate in animal tissues E) become less hazardous over time as they degrade chemically
The Ogallala Aquifer is a source of
A. minerals. B. magma. C. freshwater. D. salt water.
The life span of a typical cumulonimbus cell within a thunderstorm complex is only about ________ long.
Fill in the blank(s) with correct word