Oceans/Seas

Ocean currents are caused by-

• underwater earthquakes

• human influence

• sun moon and Earth interaction

• density and temperature differences

Why does an ice shelf float?

• it is more dense
• it is less dense
• the ice is melting faster than it can sink
• vegetation is sinking below and causing it to float

Seawater is typically denser than freshwater due to seawater's-

• greater depth

• smaller mass

• higher salinity

• lower freezing point

What sea floor feature is created by erosion and deposition?

• continental rise
• submarine canyon
• Marianas trench
• seamount

The ocean floor 

• is always a flat bed of sand 
• has mountains, plains, and ridges like land surfaces
• is covered by the same amount of water everywhere
• covers less area than land

What causes the tides to change?

• rotation of the Earth

• salinity

• gravitational pull from the moon

• ocean currents

Deep Ocean currents are a result of

• global wind

• Earth's rotation

• Density

• volcanos

Warm ocean currents generally come from

• The North Pole
• The South Pole
• The Equator
• Both A and B

Two types of water currents are

• local and global
• sea and land
• surface and deep
• warm and cold

What is an underwater mountain formed by a volcano?

• trench
• rift zone
• seamount
• mid ocean ridge