Unit 10 : Oceanography

Which best describes the continental shelf?

• a flat underwater valley 
• a region of mountains in the deep ocean 
• a shallow area of sediment near the shore 
• a region with high water pressure 

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

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The main difference between ocean water and lake water is that ocean water contains

• oxygen
• salt
• algae
• plants

Which of these increases as a submarine dives deeper into the ocean?

• The number of plants in the water
• the freshness of the water
• the water temperature
• the water pressure

As you go deeper in the ocean, the _______ decreases. 

• water
• salinity
• temperature
• water pressure 

What do the arrows represent in the picture?

• waves
• currents
• tides

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What causes the tides?

• rotation of the Earth

• The revolution of the Earth around the sun

• gravitational pull from the moon and sun

• ocean currents

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The large flat region of the ocean floor is called the 

• ocean trench
• continental shelf
• abyssal plain
• seamount 

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Why is there high salinity in the Mediterranean Ocean?

• high precipitation rates

• high evaporation rates

• volcanoes

• deposition

deep ocean currents are caused mainly by-

• underwater earthquakes

• wind

• the gravitational pull of the sun and moon

• density differences