The only substance on Earth that occurs naturally as a liquid, a solid, and a gas is ____
a. argon
b. oxygen
c. carbon dioxide
d. water
e. iron
d
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The most widely known tool to assess the size, distribution and characteristics of a population are
A) censuses. B) geodemographic analyses. C) geographic information systems. D) demographic transitions. E) keeping vital records.
The mechanism that helps nebulae to collapse into dense balls is
a. Gravity b. Pressure c. Heat d. Viscosity
When an isolated mountain range occurs in the interior of a continent, one may infer that the range formed by ____
A)the collision of two continental plates B)compressive forces acting on the opposing margins of a single plate C)the rifting of the continent D)the growth of a volcanic arc E)the emplacement of a large pluton
One of the main roles of plants in biogeochemical cycles is to
A. harden the soils. B. decrease the amount of time that water remains in contact with rocks and soils. C. extract carbon dioxide from the atmosphere. D. reduce the rate of weathering.