Question 20 options: True False Save Question 21 (1 point) Plate tectonics events can produce mountains whose uplift can cause drainage reversal in existing river systems. Question 21 options: True False Save Question 22 (1 point) Since it’s unrealistic to build levees and reservoirs that could prevent all conceivable floods, it’s sensible to allow some floodplains to revert to wetlands and to create floodways where flooding damage would be minimal.
Question 22 options: True False Save Question 23 (1 point) All seas Question 23 options: have salinity ranging between 1 and 4.1%. have a surface temperature of 17°C, ± 2°C. have similar floors consisting of wide, gently sloping continental shelves, steeper continental slopes, gentle rises, and flat plains. have yearly temperature fluctuations of about 15°C. have calm bottom waters with no apparent circulation. Save Question 24 (1 point) Oceans currently cover approximately how much of the Earth’s surface? Question 24 options: 55% 60%
65% 70% 75% Save Question 25 (1 point) The average depth of the oceans is approximately Question 25 options: 3 km. 5 km. 8 km. 11 km. 11 miles. Save Question 26 (1 point) Pick out the FALSE statement. Hurricanes Question 26 options: are huge storms that develop over warm equatorial ocean water. can have winds exceeding 155 mph.
temporarily raise sea-level by more than 10 feet as they pass over a region. have high air pressure, little wind, and clear weather in their centers. are fundamentally different from typhoons and tropical cyclones. Save Question 27 (1 point) If all of Earth’s ocean water evaporated, how thick a layer of salt minerals would be formed? Question 27 options: 6 m 16 m 60 m 160 m 160 yards Save Question 28 (1 point) Circular surface currents in major ocean basins are called Question 28 options:
loop currents. circle currents. thermohaline belts. downwelling. gyres. Save Question 29 (1 point) A combination of surface currents and vertical thermohaline circulation acts as a conveyor belt and moves water and heat among ocean basins and from ocean surface to ocean floor. Question 29 options: True False Save Question 30 (1 point) Estuaries are river valleys flooded by seawater. Question 30 options: True False
Save Question 31 (1 point) Fjords are features confined to emergent coastlines. Question 31 options: True False Save
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- Fall '09
- Atlantic Ocean, Arctic Ocean