SP #3: Marine Provinces and Ocean Floor Features

Deep and narrow valleys where oceanic lithosphere sinks downward into the mantle are called ____

Deep Sea Trench

Continental shelves are underlain with oceanic crust and are not geologically part of continents

False

Hydrothermal vents are deep-sea hot springs where superheated water forces its way up through the crust

False

The continental rise lies on top of the continental slope

False

The deepest regions of the ocean are part of the relatively narrow seafloor features called submarine canyons

False

Flat topped, submerged seamounts are called ____

Guyot

Where is the seafloor deepest

B Deep Sea Trenches

Passive continental margins are characterized by all of the following EXCEPT:

B Deep-Sea Trenches

Why does extremely hot liquid water, and not steam, emit from Black smokers

B The high pressure at their ocean depths raises water's boiling point

Geologically, the edge of a continent is marked by

C Lowest Part of the Continental Slop

The abyssal plain is extremely flat because

C Thick Sediment Layers Cover the Irregularity of the Seafloor Beneath It

Active continental margins are characterized by

D All of the Above

The correct order of seafloor features from the coast to the mid-ocean ridge is:

D Shelf, Slope, Rise, and Abyssal Plain

The continental rise is often absent along Pacific margins because

D There are Many Deep-Sea Trenches

More tahn 80% of Earth's volcanic activity occurs on the seafloor at submerged mountain ranges called _____

Ridge

Submerged volcanic features on the seafloor that are less than 1000 meters tall are called _____

Sea Knoll

Submerged volcanic features on the ocean floor that are more than 1000 meters tall are called _____

Sea Mount

Deep and narrow valleys that cut across the continental slope and shelf are called ___

Submarine Canyon

Active continental margins are found mainly around the Pacific Ocean

True

Satellites can be used to map the seafloor because the shape of the ocean surface reflects large features on the seafloor below

True

The Pacific Ring of Fire is the seismically active area along the margins of the Pacific Ocean where earthquakes and volcanoes are common

True

The tallest mountains and deepest valleys on Earth are found on the ocean floor

True