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________ develop where oceanic lithosphere bends downward and sinks into the mantle.
Deep ocean trenches
Compared to the Southern Hemisphere, a higher percentage of the Northern Hemisphere is water covered.
Water depths and seafloor topography are now routinely determined by ________.
ship-mounted echo sounders
The west coast of South America and the east coast of North America have very different continental margins.
Where in the oceans are biological communities thriving without sunlight?
around seafloor, hot spring vents
Which one of the following would typically have the widest continental shelf?
a tectonically passive, trailing continental margin
Which one of the following would most likely be covered with thick turbidite layers?
deep-sea fan at the base of a continental slope
Manganese nodules do not accumulate below 4500 meters depth because the manganese minerals are highly soluble in seawater below that depth.
An echo sounder operates by measuring the time required for a ________.
sound pulse travels from a ship to the seafloor and back
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