When we see a half-moon, the position of the Sun is
A. almost directly behind the Moon.
B. at right angles to a line from Earth to the Moon.
C. almost directly behind the Earth.
D. about 45° from a line from Earth to the Moon.
Answer: B
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Which of the following factors makes a site near a volcano relatively more dangerous?
A) The nearby slopes on the volcano are gentle B) A site that is within a valley that drains the volcano C) A site that is upwind from the volcano D) All of these are correct. E) None of these are correct.
One way to maintain soil fertility is through ____.
A. soil salinization B. waterlogging C. slash-and-burn agriculture D. soil conservation E. aquaculture
How is a forward-flank downdraft produced?
What will be the ideal response?
Fracking is used in the extraction of ________
A) natural gas trapped in shale B) organic pollutants from freshwater aquifers C) petroleum from coal deposits D) natural gas trapped in granite and sand E) petroleum from tar sands