The Ocean

A deep canyon in the ocean floor is called a(n)

• abyssal plain

• seamount

• trench

• continental shelf

As you descend through the water column,

• temperature decreases

• pressure decreases

• light increases

• density decreases

AS a wave nears shore, the wave height increases and the wavelength

• decreases

• increases

• stays the same

• doubles

The lowest point of a wave is the

• crest

• wavelength

• trough

• frequency

When a tsunami hits the shore, it can be very destructive because of its large

• sandbar

• trough

• wave height

• frequency

Dunes reduce beach erosion because

• they cause the tides to go higher

• they cause waves to break offshore

• the roots of dune plants hold sand in place

• they prevent people from walking on the beach

A large stream of moving water that flows through the oceans is called a(n)

• current

• tsunami

• tide

• undertow

A rush of water that flows rapidly back to sea through a narrow opening is called a

• longshore drift

• breaker

• tsunami

• rip current

To reduce erosion along a strip of beach, you might build a short wall called a

• dune

• barrier beach

• groin

• sandbar

Salinity is a measure of which of the following in water?

• carbon dioxide

• oxygen

• dissolved salts

• sand