1. The Water Cycle

2. Water on Earth
Oceans cover nearly 71 percent of Earth's surface.

3. Most of Earth's water—roughly 97 percent—is salt water that is found in the oceans.

4. Eventually, we harvest that salt for our use!

5. Only 3 percent is fresh water.
Of that 3 percent, about three quarters is found in the huge masses of ice near the North and South Poles.

6. Water on Earth A fraction more is found in the atmosphere.
Most water in the atmosphere is invisible water vapor, the gaseous form of water.

7. Water on Earth
Less than 1 percent of the water on Earth is fresh water that is available for animals to use.

8. Water on Earth

9. Water on Earth Types of water on Earth Oceans Ice Rivers and Lakes
Below Earth's Surface  
Water that fills the cracks and spaces in underground soil and rock layers is called groundwater. Far more fresh water is located underground than in all Earth's rivers and lakes.

10. The Water Cycle Water is naturally recycled through the water cycle.
The water cycle is the continuous process by which water moves through the living and nonliving parts of the environment.
The sun is the source of energy that drives the water cycle.
In the water cycle, water moves from bodies of water, land, and living things on Earth's surface to the atmosphere and back to Earth's surface.

11. The Water Cycle Water is constantly moving between sea, air and land

12. The Water Cycle Water is constantly moving between sea, air and land
The sun shines and the sea is heated
heat

13. The Water Cycle Water is constantly moving between sea, air and land
The water evaporates and forms clouds
Evaporation

14. The Water Cycle Water is constantly moving between sea, air and land
Condensation
As air rises it cools and condenses. It reaches the ground as rain, snow, sleet or hail.

15. The Water Cycle Water is constantly moving between sea, air and land
Snow forms
Lakes form
The snow melts and flows
Rivers flow to the sea

16. The Water Cycle Water is constantly moving between sea, air and land
The Water Cycle is complete

17. The Water Cycle Steps of the Water Cycle Water Evaporates Clouds Form
Water Falls as Precipitation  
And then it starts again

18. Water Evaporates  
Evaporation is the process by which molecules at the surface of a liquid absorb enough energy to change to the gaseous state.
Water can evaporate from where?
Ocean
Lakes
Soil, puddles, and even from your skin
Plants
Eventually the water is given off through the leaves as water vapor in a process called transpiration

19. Clouds Form Water molecules find their way into the atmosphere,
warm air carries it upward.
Higher up, air tends to become much colder.
Cold air holds less water vapor than warm air.
Some of the water vapor cools and condenses into liquid water.
Condensed droplets of water clump together around tiny dust particles in the air, forming clouds

21. Water Falls as Precipitation
As more water vapor condenses, water droplets in a cloud eventually become so heavy that they fall back to Earth.
Water that falls to Earth as rain, snow, hail, or sleet is called precipitation.
Most precipitation falls directly into the oceans.
Precipitation is the source of all fresh water on and below Earth's surface.
The water cycle renews the usable supply of fresh water on Earth.

23. The Water Cycle

24. How Do People Use Water?
The water people use at home is just a small percentage of all the water used in the United States.
In addition to household purposes, people use water for
Agriculture
Industry
Transportation
Recreation

25. Agriculture Farms need a constant supply of fresh water
Irrigation is the process of supplying water to areas of land to make them suitable for growing crops.
In the U.S., more water is used for irrigating farmland than for any other single purpose.

26. Industry What objects require water to produce them?
Water is needed to produce most objects.
Water plays a role in the industrial processes that created them.
Power plants and steel mills both need huge volumes of water to cool down hot machinery.

27. Transportation
Oceans and rivers have been used for transporting people and goods since ancient times

28. Recreation
Swimming, Fishing, Going to the beach, skiing, snowboarding, Water park etc.

29. Water Usage

30. Water and Living Things
Water makes up nearly two thirds of your body. That water is necessary to keep your body functioning.
Water is essential for living things to grow, reproduce, and carry out other important processes.
Plants use water, plus carbon dioxide and energy from the sun, to make food in a process called photosynthesis.