How does vegetation removal affect the contribution of sediment to streams?
What will be an ideal response?
ANSWER: Some water is taken up by plants in the form of transpiration, the natural evaporation of rainfall from leaves and removal of water from soil via roots through the leaves. When vegetation is removed, more water soaks into the ground and runs off its surface. More water penetrating a slope tends to promote landslides, which in some areas contribute as much as 85% of the sediment supplied to a stream. That upsets the balance of the stream, causing increased sediment deposition and increased flooding downstream.
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Which of the following is not true of faults?
A) They are the locations of most earthquakes. B) They are cracks through which magma erupts. C) They can control the flow of fossil fuels. D) They can control the flow of groundwater.
A coin and a feather have equal accelerations when falling in a vacuum because
A. they have unequal masses but equal weights. B. the force of gravity on both is the same. C. both of these. D. none of the above
The structure of the antiviral drug vidarabine is most similar that of which nucleoside?
A) adenosine B) cytidine C) guanosine D) uridine
What causes a blowout?
A. Oil platforms are destroyed by hurricanes B. A high pressure zone is encountered while drilling C. Oil platforms are hit by tankers D. Too much gas is produced during refining