Exam 11: The Ocean Floor

Pieces of the complete cross section of ocean crust that have been added to continents are called ________.

Which is the best description of a mid-ocean ridge?

Name two types of sediment particles that make it to the deep sea.

Name three metals that are found in the chimney-shaped structures that form at the black smoker vents and in other related volcanogenic massive sulphide deposits.

Name two different kinds of large scale bathymetric features found in the deep ocean basins?

Which one of the following is not connected in any way with submarine, hot spring vents?

What was the original cause of the 1929 turbidity currents that cut submarine cables off Newfoundland?

________ is a characteristic, internal structure exhibited by turbidite sediment layers.

How thick are the accumulations of shallow water sediments on passive continental margins like the Scotian Shelf?

Where are most of the current active continental margins located on Earth today? Why? What is the relationship of the age of rocks on the ocean floor to the location of these active margins?

Examine the words and/or phrases for each question below and determine the relationship among the majority of words/phrases. -Choose the option that does not fit the pattern.

Most shelf areas are underlain by continental or oceanic crust?

The seafloor is mostly flat or featureless with few submarine landforms and little bathymetric relief.

What sedimentary process is mainly responsible for the accumulation of up to 9 kilometres of sediment in deep ocean trenches?

The Continental Shelf is a flooded or subsided extension of the continental crust.

Sand, silt, and clays deposited on the ocean floor are described as terrigenous sediments.

What thicknesses of unconsolidated sediment typically covers the deep abyssal plains?

Which one of the following is not typical of sandy turbidite deposits?

Explain why some eroded, subsiding or drowned volcanic islands become coral reefs while others do not.

The geologic process responsible for the most rugged relief to be found on a passive margin's continental shelf is ________.