Which of the following materials has high porosity and high permeability?
A. compacted clay
B. unfractured granite
C. well-sorted gravel
D. uncompacted clay
E. poorly sorted sand, silt, and clay
Answer: C
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A. herbs B. epiphytes C. canopy D. mesquite E. lianas
Which of these is NOT always true of fuel cells and hydrogen as a fuel source?
a. Making hydrogen does not produce greenhouse gases. b. Water and heat are the only waste products from an operating fuel cell. c. We will not run out of sources from which to get hydrogen. d. Fuel cells only require a source of hydrogen and oxygen from the air to work.
What type of basaltic feature is shown in this photograph?
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