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

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