Unit 4. The hydrosphere

What are the roperties of water?

• It doesn't permit many chemical reactions.

• Water can't change its state dependend on temperature

• It has very cold capacity. Therefore, it is a termal regulator.

• In water state, water is less dense than liquid, therefore, ice floats.

When the gas state changes to a solid, it is called

When the liquid state changes to a gas, it is called...

• Condensation

• Vaporisation

• Inverse sublimation

• Solidification

The importance of water for living things

• Live under the ice

• The universal solvent

• Thermal regulator

• Chemical reactions

In cold seasons, water remains liquid______, so, it permite live survive.

Water can transport substances such as nutrients and wastes

• The universal solvent

• Live under the ice

• Thermal regulator

• Chemical reactions

Water needs a lot of ____ for increasing its temperature.

Distribution of water on Earth

• 97% fresh oceans

  2,5% fresh water

• 2,5% fresh oceans

  97% fresh water

• 69% fresh oceans

  31% fresh water

• 70% fresh oceans

  30% fresh water

Uses of water

Main resources of pollution