Exam 3: The Sea Floor

Abyssal plains are the flattest features on Earth.

The continental shelves of the world are typically covered by relatively young sediments derived from ___________.

Water depth increases over a continental shelf to the outer edge depth of _____ to ____ meters.

An oceanic trench is a deep narrow rift parallel to the crest of a mid-oceanic ridge.

_____ currents are bottom currents that flows parallel to the slopes of the continental margin.

______ proposed that the three types of coral reefs are related to each other by subsidence of a central volcanic island.

Mid-oceanic ridges are often marked by lines of _____ that carry and precipitate metals.

A ______ is a bottom flowing current that flows parallel to the slopes of the continental margins.

A contour current is a bottom current that flows parallel to the slopes of the continental margin.

Most seamounts are ______.

Shallow focus earthquakes on the sea floor are associated with ___.

The ocean became salty as water picked up chlorine from volcanic gases and sodium and magnesium from weathering of minerals at the Earth's surface.

Oceanic trenches are marked by _______.

Most seamounts are active volcanoes.

Submarine canyons are erosional features.

The continental rise typically ends at a(n)_______ at a depth of about 5 kilometers.

Pelagic sediment is sediment that settles slowly through the ocean water.

The continental shelf is part of the ____.

A(n)_____ continental margin usually lacks a continental rise and an abyssal plain and is associated with convergent plate boundaries.

_____ are V-shaped valleys that run across continental shelves and down continental slopes.