Earth Science Module 3

The most important economic mineral resource extracted from the seafloor today is ________.

oil and gas 

The ________ Ocean is largest.

Pacific

Identify what is pictured here: 

black smokers

Sediments derived primarily from the products of weathering on the continents are called..

 terrigenous sediment

The most extensive mountain range on Earth extends for about 65,000 kilometers on the ocean floor and is known as the ________.

 mid-ocean ridge 

Calcerous Ooze is what type of ocean floor sediment? 

biogenous 

The east coast of North America has a(n) ________ continental margins.

Passive

 Manganese nodules are an example of ________.

hydrogenous sediment

What is the difference between an active continental margin and a passive continental margin?

A passive margin is the site of an ancient continental rift, left behind when seafloor spreading moved offshore, whereas an active margin is an active plate boundary.

Which one of the following is not part of the continental margin?

continental trench

 ________ does not accumulate below 4500 meters depth because it is highly soluble in seawater below that depth.

Calcium carbonate

A(n) ________ is the vast, relatively deep, flat, sediment-covered portion of the deep-ocean basin. 

 abyssal plain 

 Most of the world's landmass is in the ________ hemisphere. 

Northern

If Yellowstone were on the ocean floor, it would produce ________.

a chain of line islands, like Hawaii

A(n) ________ is a volcanic mountain, built up from the seafloor that never reached the sea surface. 

seamount

The lowest point on earth is in the Marian's Trench in the ________ Ocean.

Pacific 

Radiolarian chert is produced in the deep sea by the accumulation of siliceous radiolarian shells. What kind of sediment is radiolarian chert?

biogenous sediment 

How do atolls form?

 from fringing coral reefs around a volcano

The gently sloping submerged surface extending from the shoreline toward the deep ocean is termed the continental ________.

shelf 

The oceans cover approximately ________ percent of Earth's surface.

70