When two oceanic plates converge what determines which crust will submerge?
A) The age of the crust
B) The temperature of the crust
C) The density of the crust
D) All of these choices
D
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Which of the following represents the "three Rs" of waste disposal in the descending order of energy expenditure?
A. Reuse, reduce, recycle B. Reduce, recycle, reuse C. Recycle, reduce, reuse D. Recycle, reuse, reduce E. Reuse, recycle, reduce
An estuary is where rivers meet the ocean and where freshwater and seawater mix
Indicate whether the statement is true or false
Ecosystems have not been significantly influenced by people in virtually all parts of the world.
Answer the following statement true (T) or false (F)
When was the federal ban on chlorofluorocarbons (ozone-depleting chemicals) enacted?
A. 1964 B. 1969 C. 1974 D. 1978 E. 1984