SCIENCE 8Unit 1- Water Systems on Earth

Slideshow 1Chapter 1 -The water cycle plays a

vital role on EarthSection 1.1 – The Distribution of Water

Section 1.1 The Distribution of Water

• There is a tremendous volume of water found on Earth…

HOWEVER…………..

• Most of that water is unavailable to terrestrial organisms

The Distribution of Water

In the grid on the right 1. colour 97

blocks green2. 2 blocks red3. 1 block blue

The Distribution of Water

HOW CAN SUCH A SMALL PERCENTAGE OF AVAILABLE FRESH WATER CONTINUALLY SUPPLY ALL ORGANISMS ON EARTH?

THE WATER CYCLE

The Distribution of Water – The Water Cycle

Water on Earth is constantly cycling through periods of solid liquid and gas.

1. Evaporation – From Oceans, Lakes, Land Plants, Animals etc.

Powered by energy from the sun

2. Condensation – In the Atmosphere air cools and moisture condenses eventually falling as precipitation (Rain or Snow)

3. Precipitation that falls on land may be 1. Used by plants and animals2. Run off into oceans, via lakes streams and rivers or as

ground water 3. Evaporate back into the atmosphere

The Water Cycle

Questions

In Your Notebook Answer Questions 4,6 and 7 from page 13 of your text