H2O

Water

Where is our water

97.5% of all water on Earth is saltwater or brackish water.

1.75% of all water is frozen..75% of all of the water on Earth is available

for us to use.What is our main source for fresh water?

Groundwater

(WATER CYCLE)

Hydrologic Cycle

Vocabulary Review

Hydrosphere water

Lithosphere land

Atmosphere air

Biosphere organisms

Steps in the Hydrologic Cycle

Precipitation Water falling from the sky

Steps in the Hydrologic Cycle

Evaporation Liquid water turns into water vapor

Heat is added

Steps in the Hydrologic Cycle

Condensation Water vapor turns in to liquid water

Heat is given off

Heat transfer

When water changes states heat is transferred

Where does the energy come from? Where does it go?

Energy cannot be created or destroyed

Steps in the Hydrologic Cycle

Runoff The flow of water over land

Powered by gravity

Steps in the Hydrologic Cycle

Transpiration Water vapor given off by plants

Surface water

Lakes, rivers, ponds

Steps in the Hydrologic Cycle

Ground water the water located beneath the earth's surface in soil

pore spaces and in the fractures of rock formations

Groundwater

VocabularyPorosity is a measure of how much of a rock

is open space. This space can be between grains or within cracks or cavities of the rock.

Permeability is a measure of the ease with which a fluid (water in this case) can move through a porous rock.

Aquifer

a body of saturated rock through which water can easily move.

Water Table

The upper surface of the zone of saturationDigging in the sand

Recharge

Refilling of the aquifersRain/snow percolates/seeps down in to the

porous rock

Wetlands

An area of land that is saturated with water

Wetlands

Wetlands help cleanse our water

Wetlands contain great biodiversity

Natural Cleaning of the Water

Evaporation cleans the waterPercolation filters the waterWetlands filter the water

Human Impact on Freshwater

PollutionBuildings/PavingDestruction of wetlands