Only about 2.5% of all the water on our planet is freshwater, however, ________
A) most of this is in underground aquifers
B) over half of this is extremely hard water and is nearly unusable for drinking or agriculture
C) over half of this is in wetlands near coastlines and is becoming contaminated with saltwater
D) most of this is in polar ice caps, glaciers, and underground aquifers and is not easily accessed for human use
E) most of this is in large, freshwater lakes
D
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Magma plumes ____.?
a. ?only create volcanoes on oceanic plates b. ?create volcanoes on both oceanic and continental plates c. ?only create volcanoes on continental plates d. ?create only volcanoes on oceanic plates, and only earthquakes on continental plates e. ?create only earthquakes on oceanic plates, and only volcanoes on continental plates
In which of the following can hydrogen bonding occur?
A) in pure formaldehyde B) in pure acetone C) in a solution of formaldehyde in water D) in none of these cases
The two main types of glaciers are ________ glaciers
A) alpine and continental B) moraine and alpine C) valley and continental D) firn and continental E) cirque and alpine
Which of the following pollution sources would be considered to be a non-point source?
A. all of the answers listed here B. residual oil in parking lots from leaking cars and trucks C. pesticides spread on farm fields D. cows on dairy farms E. lawn fertilizers in housing developments