1. 7th grade Science Brookville Intermediate School
The Water Cycle
7th grade Science
Brookville Intermediate School

2. Water on Earth

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

7. The Water Cycle Water is naturally recycled
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

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

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

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

11. 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.

12. 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

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

14. The Water Cycle

15. Water Evaporates  
Evaporation: 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

16. Clouds Form  
Water molecules find their way into the atmosphere, warm air carries it upward.
Higher up, air tends to become much colder which 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

18. 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.
Precipitation is the source of all fresh water on and below Earth's surface.

20. The Water Cycle

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