1. 1. The Water Cycle is a continuous movement of water from the Earth’s surface to the air and back to the surface. Review 12: The Earth’s Water

2. 2. Hydrosphere – all of the Earth’s water found underground, on the surface and in the air. 3. Atmosphere – the layers of air that surround the Earth. 2. Hydrosphere – all of the Earth’s water found underground, on the surface and in the air. 3. Atmosphere – the layers of air that surround the Earth. Review 12: The Earth’s Water 4. Water vapor – the gas form of water

3. 5. Evaporation – to change from a liquid to a gas. 6. Condensation – the process in which something changes from a gas to a liquid.

4. 7. Precipitation – water that falls from the clouds to the Earth; can be rain, hail or snow Review 12: The Earth’s Water

5. Condensation EvaporationPrecipitation RunoffWaterWater Vapor

6. Review 12: The Earth’s Water ~ 75% of the Earth’s surface is covered in water. ~ 97% is undrinkable salt water. ~ 2% is trapped in ice and glaciers. ~ That leaves only 1% of Earth’s water available for us to drink! ~ This water is found in lakes, wetlands, rivers, and underground.

7. When the water vapor condenses in the air and falls to ground as precipitation, it can form runoff. Runoff is water that’s not absorbed into the Earth, but runs back into a body of water. Groundwater is the water that absorbs into the ground. This water can collect underground in layers of rock, gravel, or sand to form aquifers. A human body is about 65% water. How old do you think this water is? Why? When the water vapor condenses in the air and falls to ground as precipitation, it can form runoff. Runoff is water that’s not absorbed into the Earth, but runs back into a body of water. Groundwater is the water that absorbs into the ground. This water can collect underground in layers of rock, gravel, or sand to form aquifers. A human body is about 65% water. How old do you think this water is? Why? Review 12: The Earth’s Water

8. As runoff collects into larger bodies of water, it makes different types of water systems. ~ The lotic system is a water system where water is in motion (moving). The movement of the water is caused by changes in the land. ~ The lentic system is a water system where water is not in motion. Lakes and ponds are examples. What are some of the differences in ecosystems of lotic and lentic water systems? As runoff collects into larger bodies of water, it makes different types of water systems. ~ The lotic system is a water system where water is in motion (moving). The movement of the water is caused by changes in the land. ~ The lentic system is a water system where water is not in motion. Lakes and ponds are examples. What are some of the differences in ecosystems of lotic and lentic water systems? Review 12: The Earth’s Water

9. When multiple lotic (moving) water systems collect into larger bodies of water, the result is a watershed. ~ Watersheds are important because they transport water to places that might not receive much rainfall. ~ Wastewater from homes and storm sewers, along with chemicals and garbage can drain into and pollute your local watershed. Click here to take a road trip with a raindrop through a watershed. What is your local watershed called? Where does your community get its water? Click here to find out. When multiple lotic (moving) water systems collect into larger bodies of water, the result is a watershed. ~ Watersheds are important because they transport water to places that might not receive much rainfall. ~ Wastewater from homes and storm sewers, along with chemicals and garbage can drain into and pollute your local watershed. Click here to take a road trip with a raindrop through a watershed. What is your local watershed called? Where does your community get its water? Click here to find out. Review 12: The Earth’s Water