The Hydrosphere

What percetage of the water on Earth is salt water ?

• 74%

• 62%

• 97%

• 90%

What are ocean currents?

• Gerat ocean flood presure depressions

• Inexhaustible sources of energy

• Ecological shields

• They are like great rivers that flow through the oceans

What are the waves?

• The waves are the tides

• The rise and fall of the level of the sea

• Great rivers that flow through the oceans

• Ripples formed when the wind shakes the surface of the water

What are the tides?

• Sea water on Earth

• Rises and fall of the sea level

• Water vapor

The tides change every....

• 6 hours

• 2 hours

• 4 hours

• 12 hours

What is a river?

• The water that are accumulated

• A path of frozen waters

• A continuous stream of water

• None of the above is correct

What's a river regime?

• The amount of water a rivers carries

• The path of a river

• The flow variations through the year

What is the flow of a river?

• The path

• The variations through the year

• The amount of water it carries

• The contamination of a river

What is the cryosphere?

• The set of all continetal waters

• The set of all ice waters

• The set of rivers

Where is the greatest amount of fresh water found?

• In rivers and lakes

• In oceans and seas

• In glaciers nad polar caps

• In groundwater