Two planets in space gravitationally attract each other. If the mass of one planet is doubled, with no change in distance between them, gravitational force is
A. four times as much.
B. one-quarter.
C. half as much.
D. twice as much.
Answer: D
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Proven reserves of fossil fuels are those demonstrable to be economically recoverable.
Answer the following statement true (T) or false (F)
Which of the following statements best describes slump?
a) slippage of a mass of material moving as a unit along a curved surface b) blocks of bedrock sliding down a slope c) a rapid flowage of debris containing a large amount of water and most common in arid, mountainous areas d) a slow, downhill movement of soil and regolith e) none of these
The two dynamic pressure areas are the subpolar lows and subtropical highs
Indicate whether the statement is true or false
Which of the following is released by volcanic activity into the atmosphere?
A. SO2 B. water vapor C. NO2 D. CO