The best description of anthropogenic activities is ________
A) human activities that reduce carbon emissions through taxing fuel used for automobiles
B) human activities that increase greenhouse gases in the atmosphere
C) all activities by humans affecting the Earth and its biosphere
D) human activities that reduce carbon emissions through tax credits for reducing automobile emissions
E) human activities that decrease greenhouse gases in the atmosphere
C
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Desert soils
A. accumulate more litter than other soils. B. have a thick B horizon. C. have poorly developed horizons. D. None of the statements is correct.
Outwash is composed of:
a. silt, sand, clay, and boulders b. silt and clay c. silt d. sand and gravel
The main difference between firn and glacial ice is:
a. firn has a bluer color. b. firn has a lower density. c. firn flows plastically. d. firn is older. e. firn is the German word for glacial ice.
Which of the following will cause soils to appear bright red or yellow?
A. quartz minerals B. organic material C. iron oxide minerals D. clay minerals E. all of the answers listed here