6th - Exploring the Ocean

Ocean water freezes at a ________ temperature than fresh water.

• lower

• higher

A ________ is a volcanic mountain that forms near a mid-ocean ridge.

• trench

• continental shelf

• seamount

• continental slope

Freshwater has a ________ density than salt water.

• higher

• lower

A gently sloping continental _______extends from the edge of each continent.

• table

• ledge

• trench

• shelf

True or False: As you descend, or go deeper below the ocean surface, the temperature increases.

• True

• False

The amount of sodium chloride and other salts that are dissolved in a water sample is the water's ________.

• temperature

• density

• salinity

• volume

A ________ is a long, deep valley on the ocean floor through which old ocean floor sinks back toward the mantle.

• trench

• seamount

• continental shelf

• continental slope

The ________ plain is a smooth, nearly flat region of the ocean floor covered with thick layers of mud and silt.

• cavernous

• immeasurable

• continental

• abyssal

Scientists use ________, a major form of ocean-floor mapping that uses sound waves to calculate the distance to an object.

• echo sounders

• sonar

• pulse generators

• telescopes

True or False: Water pressure increases with depth in the ocean.

• True

• False