Exam 3: The Sea Floor and Its Sediments

Red clay obtains its characteristic color from ________.

The smaller the footprint of a sound beam, the greater the detail of the seafloor features.

The floor of a major ocean basin is called a(n) ________.

Submarine canyons are features associated principally with the continental slope; some are associated with past or present rivers.

Siliceous oozes are found at all ocean depths because of the slow dissolving rate of silica.

Continental margins consist of the following in increasing distance from the shore.

The seabed is presently being mined in the United States for ________.

The silica rich oozes of the Pacific Ocean are due to ________ at high latitudes and ________ at low latitudes.

Turbidites are ________.

Major deposits of silicous oozes from the radiolaria are found centered on which latitudes?

Which of the following is least likely to be a major component of marine sediments?

Which of the following is NOT true about passive continental margins?

Coral and foraminifera produce biogenic sediments based on the element ________.

Calcareous sediments are well-preserved in cold, deep water below the CCD.

In general, sedimentation rates decrease further offshore.

Abyssal hills are single, rounded domes extending at least 3 km above the deep-sea floor.

Red mud or brown clay deposits are found under oceanic regions of high biological productivity.

Which of the following is most likely a major component of open-ocean sediments at depths shallower than the CCD?

Calcareous sediments of the North Atlantic occur at deeper depths than calcareous sediments in the North Pacific.

Seventy-five percent of all marine sediments are ________.