Earth's Ocean

Multiple Choice

Approximately what percentage of Earth's water is SALT water?

• 97 %
• 71%
• 30%
• 3%

Multiple Choice

Approximately what percentage of Earth's water is FRESH water?

• 97 %
• 71%
• 30%
• 3%

Open Ended

Describe the hydrosphere.

Open Ended

Describe two different roles the ocean plays in the water cycle.

Multiple Choice

How are different sections of the ocean connected?

• they are not connected

• rivers and streams

• circulation

Multiple Choice

Why is the Equator warmest?

• Because it receives the most direct sunlight
• Because no clouds form here.
• Because it is far from the sun

Multiple Choice

What makes up most of the water on Earth?

• Salt water

• Fresh water

Open Ended

How do the circular patterns of ocean currents in the northern hemisphere compare to those in the southern hemisphere?

Multiple Select

What factors may affect the direction and movement of ocean currents?

• wind

• temperature

• location of land masses

• rotation of the Earth

Multiple Choice

What is salinity?

• A measure of the amount of sugar dissolved in water

• A measure of the amount of salt dissolved in water

• A measure of the amount of salt in the soil

• A measure of the amount of water in the ocean

Multiple Choice

What body of water has the lowest salinity?

• Indian Ocean

• Caribbean Sea

• Arctic Ocean

• Antarctic Ocean

Multiple Choice

What body of water has the highest salinity?

• Indian Ocean

• Caribbean Sea

• Arctic Ocean

• Antarctic Ocean

Open Ended

Why are the surface waters of the Arctic Ocean lower in salinity than the surface waters of the Caribbean Sea?

Open Ended

Can oil spilled on land pollute the ocean? Explain your answer.

Open Ended

Through what processes in the water cycle is the ocean connected to all of Earth's water?

Multiple Choice

Which of these is the largest source of salt water?

• Rivers
• Lakes
• Oceans
• Streams

Multiple Select

Select all sources of freshwater

• rivers
• oceans
• lakes
• streams