Of all the sources of pollution, which one releases the greatest amount of toxic substances into the environment?
A) Homes
B) Automobiles
C) Small businesses
D) Industrial facilities
D
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Ecotones are the ________
A) studies of specific biomes by ecologists B) sounds that animal communities make in ecosystems C) areas between territories of organisms D) interactive behaviors leading to communication E) transitional zones between ecosystems
The driest period of the year in the climates of eastern China occurs in the __________________ season
Fill in the blank(s) with correct word
Who is the discoverer of sea-floor spreading?
a. Alfred Wagener b. Harry Hess c. James Hutton d. Charles Darwin
Which is a factor that determines the location of a coast?
a. Distribution of sediments b. Erosion of land c. Uplift and subsidence d. Wave energy e. Global tectonic activity