A) salt taken from mines
B) salt obtained by evaporating seawater in dry climates
C) combining the metal sodium and the nonmetal chlorine gas in a chemical reaction vessel to make pure NaCl
D) China
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A) high resolution measurements of the earth's magnetic field
B) laser beams that penetrate to the sea floor
C) radar pulses that bounce off the ocean surface
D) powerful sound waves that echo to the satellite
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A) The percentage of land and water is about the same in both the Northern and Southern Hemispheres.
B) The Southern Hemisphere has much more water surface than the Northern Hemisphere.
C) The Northern Hemisphere has much more water surface than the Southern Hemisphere.
D) None of the above is true.
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A) continental slope
B) continental rise
C) continental shelf
D) beach shoreface
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C
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A) as a source of lime from sea shells
B) as a source of mud to mix with limestone to make Portland cement
C) They can rape the sea bed without being prosecuted like they would in operating a quarry or gravel pit improperly.
D) as a source of sand and gravel
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A) the gradient becomes very gentle
B) the water depth reaches 100 fathoms
C) it meets an oceanic ridge
D) a rapid steepening of the gradient occurs
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A) light beam to travel from a satellite at a known altitude to the sea bottom and back
B) radar beam to travel from a harbor patrol boat to a fuzz-buster on a speeding yacht
C) radar beam to travel from a ship to the seafloor and back
D) sound pulse travels from a ship to the seafloor and back
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A) Submarine canyons
B) Abyssal seamounts
C) Deep ocean trenches
D) Rift valleys on mid-ocean ridges
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C
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A) streams when sea level was much lower than it is today
B) streams when sea level was much higher than it is today
C) a submarine glaciations
D) turbidity currents
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A) rift zones
B) mountainous topography
C) volcanic structures
D) all of these
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D
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A) are a special type of oceanic trench
B) are volcanoes that form on the ocean floor
C) form only in the Pacific Ocean basin
D) are submarine canyons found near Australia
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A) rocks bulge up in ridges along transform faults associated with the ridge
B) they are a broad seafloor highland formed by sea floor spreading
C) they are submarine collisional mountain belts,forming submarine mountains that haven't yet risen from the sea floor
D) they are chains of volcanos,like the Hawaiian Islands,that form along hot spots
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A) They didn't care about the risk,they just drove forward.
B) The oil and gas industry is poor at assessing risk,and didn't understand the risk.
C) The potential profit is so large from a major oil find that the companies take the risk,try to use all cautions to minimize risk,but sometimes fail.
D) They just assume their lawyers can win any lawsuit,regardless of the disaster.
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A) Atlantic
B) Pacific
C) Indian
D) Arctic
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A) basalt volcanos on the seafloor produce little terrain
B) sediments accumulate to cover the seafloor topography
C) they have flat faults,the form flat,planar topography
D) they are not really flat; it is just that there is no data so they are shown as flat
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