continental margins and ocean basins part 2

Over long periods, the rise and fall of sea level has largely been driven by ________________________.

the coming and going of ice ages

Sea level was at its lowest level about _________________ years ago.

18,000

During the last interglacial period, sea level was about _____ m higher than today.

6

Deep cuts in the continental shelf running at right angles to the coast are called _________________________.

Submarine canyons

Flows of dense, sediment-laden water moving downslope are called ____________________________.

Turbidity Currents

Spreading on either side of oceanic ridges is measured in ____________________.

cm/year

What gives the water emerging from hydrothermal vents a black smoke-like appearance?

dissolved minerals particularly sulfides

A flat-topped undersea mountain is called a _________________.

guyot

The waters over the continental shelf are referred to as the ___________________ zone.

littoral

Open water containing the oceanic and littoral zones is termed the __________________ zone.

Pelagic