Without convection, there would be no volcanoes on Earth because
A) all the convecting material spurts out at the surface.
B) rising mantle material undergoes decompression melting.
C) molten outer-core melts the lower continental crust.
D) volcanoes sink down into Earth near down-going convention cells.
Answer: B
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Which of the following is the relationship between the rem and the sievert?
A) 1 Sv = 100 rem B) 1 Sv = 1000 rem C) 1 Sv = 0.01 rem D) 1 Sv = 0.001 rem
Which of the following is the best example of a positive feedback effect?
a. ?Melting ice exposes the dark surface of the ocean, which reflects less of the sun’s energy than ice. This heats the water and in turn, melts more ice. b. ?Melting ice exposes the dark surface of the ocean, which reflects more of the sun’s energy than ice. This heats the water and in turn, melts more ice. c. ?Melting ice allows ocean levels to rise and reduce the surface area of the remaining ice, slowing its melting rate. d. ?Aerosols block the sun’s radiation, slowing the melting of ice. e. ?Aerosols cause air pollution, which increases local drought conditions.
Why are drain holes an essential part of a retaining wall? What will be an ideal response?
In general, natural resources ________
A) should not be used B) belong only to those on whose property they exist C) should be used by everyone equally D) are evenly divided among all countries E) should be used efficiently and conserved