Our water supply

water that flows from mountains into rivers and lakes

• run off

• polluted water

• sludge

water soaking through the ground

• sewage

• percolation

• run off

water changing from liquid to vapor

• sublimation

• condensation

• evaporation

Tiny living things such as bacteria

• chemicals

• microbes

• sludge

water given off by plants

• evaporation

• transpiration

• humidity

Liquid water changing into solid

• melting

• freezing

• boiling

A natural gas made when microbes digest waste material

• Bio gas

• nitrogen

• oxygen

Reservoirs that control the flow of water and prevent floods

• Dams

• water tanks

• Aquifers

Amount of water vapors in the air is called

• evaporation

• Humidity

• Fog

Solid waste from sewage is

• microbes

• bio solids

• sludge