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27 terms

Geology Chapter 16

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The continental rise lies at the top of the continental slope.
false
________ develop where oceanic lithosphere bends downward and sinks into the mantle.
Deep ocean trenches
The Atlantic and Pacific basins have oceanic ridges; the Indian Ocean has no oceanic ridge.
false
Compared to the Southern Hemisphere, a higher percentage of the Northern Hemisphere is water covered.
false
Seafloor hot springs occur mainly in oceanic, abyssal plains.
false
The ________ lies at the base of the continental slope.
continental rise
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.
true
The continental rise is located ________.
at the top of the continental slope
Seamounts ________.
are volcanoes that form on the ocean floor
Turbidites and siliceous oozes are both biogenous sediments.
false
An atoll is a low, coral reef island typically surrounding an interior lagoon.
true
Where in the oceans are biological communities thriving without sunlight?
around seafloor, hot spring vents
Sand, silt, and clays deposited on the ocean floor are described as terrigenous sediments.
true
Which one of the following would typically have the widest continental shelf?
a tectonically passive, trailing continental margin
________ is the oceanward edge of a continental shelf.
The top of the continental slope
Geologically, ________ are actually submerged parts of the continents.
continental shelves
________ is/are not part of an ophiolite complex.
Residual, unmelted, crustal lithosphere
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.
false
"Black smokers" are associated with ________.
all of these
An echo sounder operates by measuring the time required for a ________.
sound pulse travels from a ship to the seafloor and back
Oceans cover approximately ________ of Earth's surface area?
70 %
Which of the following is NOT true of deep ocean trenches?
they are geologically very stable
Submarine canyons form the deepest parts of the ocean basins.
false
Submerged, flat-topped seamounts are known as guyots.
true
Which one of the following concerning mid-ocean ridges is false?
sediments include thick siliceous ooze deposits and sandy turbidite beds