Groundwater came to be in the ground how long ago?
A) During the formation of the Earth.
B) During the last ice age,12,000 years ago.
C) Within the last 1,000 years.
D) It is continuously recharged with snowmelt and rainwater.
Correct Answer:
Verified
Q7: The Clean Air Act of 1990 was
Q8: Acid precipitation is so deadly because it:
A)changes
Q9: Ten thousand years ago,when human populations began
Q10: Brown-air cities are so-called because:
A)of excessive acid
Q11: Agricultural chemicals,such as DDT,are so damaging to
Q13: Air and water pollution result mainly from:
A)increased
Q14: To be a viable alternative,nuclear power facilities
Q15: A 1% drop in atmospheric ozone is
Q16: Which one of the following helps make
Q17: One reason industrial pollution is such a
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