Geodemographers use the ________________ to determine the number of years it takes a population to double.
Fill in the blank(s) with the appropriate word(s).
rate of natural increase
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Which of the following ecosystems is considered a center of biodiversity?
A. coral reefs in the Bahamas B. deciduous forests in Vermont C. high desert in Utah D. grasslands in Kansas
Clouds continually are pulled to the ground by gravity. Why do they stay aloft?
A) Clouds weigh so little that they fall too slowly to be noticed. B) Water evaporating from Earth's surface presents an opposing force to the falling cloud droplets. C) New cloud droplets continually replace those that fall to Earth's surface. D) Updrafts of air oppose the gravitational force.
In the European Union, the countries of Greece, Ireland, Portugal, and Spain are collectively known as
a. PIGS. b. GIPS. c. IPSG. d. PSIG. e. GSIP.
Which magma type would generally have the lowest viscosity?
A) rhyolite B) andesite C) basalt D) dacite