Exam 11: The Ocean Floor

Seafloor hot springs occur mainly in oceanic, abyssal plains.

________ are the regions where basalt is the most abundant substrate exposed on the seabed.

What sedimentation rates typify the red or brown clays of the abyssal plains?

The most predominant characteristics of the mid-ocean ridge system are its elevated position, extensive (extensional)faulting, and numerous volcanic structures.

Why are the East Pacific Rise, the Gorda and Juan de Fuca Ridges all the way at the eastern side of the Pacific Ocean?

________ and ________ comprise most biogenous sediments.

A low lying, coral limestone island with a central lagoon is called an ________.

The Atlantic and Pacific basins have oceanic ridges; the Indian Ocean has no oceanic ridge.

Name two features more likely to be characteristic of active margins.

On average, the continental shelf is about ________ kilometres wide and ________ metres deep.

________ are steep sided valleys that cut across the continental slope and may extend across the continental rise into the deep ocean basin.

Submarine, basaltic lava flows chill quickly to form tube shaped protuberances called ________.