Groundwater is a nonrenewable resource because
A. groundwater is the rarest form of freshwater.
B. the amount of all water in the hydrosphere is decreasing.
C. it takes thousands of years to recharge aquifers.
D. groundwater cannot be filtered and reused.
Answer: C
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Considering the vertical dimension, which of the following describes the direction of the pressure gradient force (PGF), and the gravitational force?
A. Both forces are directed away from the Earth. B. Both forces are directed toward the Earth. C. The PGF is directed away from the Earth and the gravitational force toward the Earth. D. The PGF is directed toward the Earth and the gravitational force away from the Earth.
What is the impact of Canadian oil sands on oil reserves and supply to the United States?
What will be an ideal response?
Before becoming glacial ice, compact granular snow melts and refreezes into the substance called ____________________, with a density of about 0.5 grams per cubic centimeter
Fill in the blank(s) with correct word
A light-year is ________.
A) a long time B) the distance light travels in one (Earth) year C) a kind of super-dense star near the end of its life-cycle D) the wavelength of electromagnetic radiation between ultraviolet and infrared