Which well is least likely to need pumping?
A) a well that reaches water very near the surface at an unconfined sand and gravel aquifer
B) a well that is drilled below a confining shale layer to a confined sandstone aquifer
C) a well that is drilled deep in an unconfined sandstone aquifer
D) any well in a limestone aquifer
Answer: B
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Surface currents are driven by:
a. interaction between the sea surface and the wind b. temperature gradient c. contrasts in water density d. the vertical upwelling and downwelling of seawater
Ore deposits of the element ________ do not require extreme concentrations because it is one of the most abundant elements in the Earth's crust
A) boron B) uranium C) carbon D) aluminum
Agriculture and biodiversity will be enhanced with increased global temperatures.
Answer the following statement true (T) or false (F)
In the Northern Hemisphere about ________ percent of the surface is land
A) 7 B) 39 C) 56 D) 75 E) 91