Water Systems 1 (Grade 8)

What percentage of the earth's surface is water?

• 45%

• 67%

• 74%

• 92%

How much of the water on earth is fresh water?

• 30%
• 10%
• 5%
• 3%

Tsunamis are massive waves caused by:

• Earth's rotation
• Earthquakes
• Hurricanes
• All of the above

About how often does high tide occur?

• Once a day

• Twice a day

• Four to five times a week

• Once a month

Tides are caused by:

• Gravity
• Currents
• Wind
• Giant Sea Monsters (Kraken)

What is the Earth's Nickname?

• Steve
• Cool Jeans
• The Blue Planet
• Blue Jeans

A current is:

• a large amount of ocean water that moves in a particular and unchanging direction.
• A body of water that exists because of an unknown water source.
• The reaction of wind and temperature in the air.
• A school of endangered fish.

Ocean Currents are caused by:

• Salinity, Temperature, and Tides

• Animal Migration and Large Ships

• Wind, earth's spin, temperature, salinity

• Earthquakes

Glaciers are:

• large sheets of ice that move.
• frozen soil/permanent frost
• A cave for penguins
• A magical land where Santa's elves are from

Potable water is

• Unsafe to drink

• Safe to drink

• Fresh water

• Salt water