Oceanography

What percentage of the Earth is covered by water?

• 45

• 51

• 71

• 85

Which of the world's ocean is the deepest?

• Arctic

• Atlantic

• Indian

• Pacific

Which of these features is NOT found on the ocean floor?

• mountain

• volcano

• river

• plain

What does SONAR equipment measure?

• the density of the ocean's water

• the depth of the ocean's floor

• the noise produced by bottom-dwelling creatures

• the shape of the ocean's surface

Scientists use satellites to measure the

• ocean floor depth

• size of underwater features

• sea- surface height

• salinity

Which of the following are NOT one of the main regions of the ocean floor?

• ocean floor basin

• continental margins

• continental rock

• mid-ocean ridge

Which of the following form at mid-ocean ridges?

• island arcs

• sea stacks

• guyots

• new ocean floor

Abyssal plains are very flat features that form when

• volcanoes spread lava on the ocean floor

• turbidity currents deposit sediments on the ocean floor

• ocean waters flood plains on land

• plates diverge on the ocean floor causing sea-floor spreading

Deep ocean trenches form at the following site:

• subduction zone (convergent plate boundary)

• divergent plate movement

• slip-strike faults

• seamounts

Earth is often called the blue planet because __________covers much of its surface.

• turquoise

• water

• air

• ice