Waves and currents Review

How much of the Earth's surface is covered by water?

• 75%

• 71%

• 65%

• 50%

How much of the Earth's water is fresh water?

• 50%

• 25%

• 97%

• 3%

_______ makes water denser.

Explain what the answer to question 3 is.

How does temperature behaves in the ocean?

• The deeper you go the warmer the water gets.

• Water's temperature maintains constant no metter how deep you go.

• The deeper you go the colder the water gets.

Explain the reason why the following sentence is true. Start with explaining what water pressure is.

"At great depths water pressure becomes too great for divers to withstand":

Explain what the ocean floor looks like and describe each part. Use your own paper if you need to.

Draw a diagram to explain how volcanoes form islands. Add labels and explanations.

What is an atoll?

• A ring shaped island encircling a lagoon which stand where previously a volcanic island existed.

• Any island in the South Pacific.

• A volcanic island encircled by a coral reef.

Explain why you can't find atolls in polar waters.