List several factors that cause infiltration and runoff to vary from place to place and from time to time
What will be an ideal response?
The amount of water that runs off rather than soaking into the ground depends on the intensity and duration of rainfall, the amount of water already in the soil, the nature of the surface material, the slope of the land, and the extent and type of vegetation. When the surface material is highly impermeable or when it becomes saturated, runoff is the dominant process.
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The functioning of which of the following explains the rapid mutation of HIV?
A) the way the protease functions B) the way the reverse transcriptase functions C) both a and b D) neither a nor b
Energy that cannot be used to do useful work is referred to as
A. potential energy. B. enzymatic energy. C. entropy. D. kinetic energy.
Mt. Everest is the tallest mountain on Earth and its altitude is CLOSEST to ________ meters
A) 90 B) 900 C) 9,000 D) 90,000 E) 900,000
If a nucleus of 
Th absorbs a neutron and the resulting nucleus undergoes two successive beta decays (emitting electrons), what nucleus results?
A. thorium-233 B. plutonium-232 C. uranium-233 D. americium-232