Earth's Water

Water on Earth

By Jessica Solis

Objective: 7.8 c

​Ground water & surface water-Human activity on a watershed

Model the effects of human activity on groundwater and surface water in a watershed.

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Introduction

​Students will:

In this lesson you will learn why water is important to life on Earth, Earth's water supply, and how water cycles on Earth.

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The graph shows the water used per person in the ten states of the United States with the largest populations.

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​Data shows water used for all purposes

​How much water do you use?

Open Ended

In which state is the water use person greatest?

Open Ended

In which state is it least?

Why is water important?

​body processes & Habitats

• Water allows organisms to break down food, grow and reproduce, and get and use materials they need from their environments.​

• Water provides habitats for organisms such as sharks, as well as microscopic ​organisms too!

Discuss examples shown in photo with a partner

where is water found?

​most of earth's surface water---roughly 97 percent---is salt water found in oceans. only 3 percent is fresh water!!

Most water on Earth is found in oceans. The Pacific Ocean is the largest, covering an area greater than all the land on Earth! Much of Earth's fresh water is frozen in sheets of ice! Rivers and lakes contain freshwater. Groundwater is also freshwater.

Analyzing data

Poll

Where is most water on Earth found?

• lakes and rivers

• ground water

• salt water in oceans and salt lakes

• ice

Multiple Choice

About what fraction of Earth's water is in the form of ice?

• 1/4

• 3/4

• 1/2

• 1/3

To find fresh water on Earth, you need to look underground. When it rains or snows, water soaks into the ground.

​​groundwater

All rivers and lakes marked on the map contain freshwater. The Great Lakes in North America make up about 20% of all the water in the worlds freshwater lakes

​Rivers and lakes

Where is fresh water found?

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Draw

Underline the names of three fresh water sources. Circle the names of three saltwater sources.

Groundwater

​When it rains or snows, water that does not evaporate soaks into the ground. The water trickles through spaces between particles of soil and rock. Water that fills the cracks and spaces in underground soil and rock layers is called groundwater. Far more freshwater is located underground than in all of Earth's rivers and lakes.

The picture above illustrates groundwater​