Chapter 11 Lesson 1, "The Water Cycle"

Materials:

• Worksheet, "The Water Cycle"
• Personal Water Budget

Objective:

• Students will describe the movement of water through the water cycle.
• Students will identify how water runs off land.
• Students will compare fresh water and salt water.

Anticipatory Set:* Show the students a demonstration of where water is on Earth. Fill a 100 milliliter graduated cylinder with water. Tell the students that this represents all the water on earth. Take out five small jars. With an eyedropper put 3 drops into the groundwater jar, 2 drops into the Lakes and Rivers jar, 1 drop into the Atmosphere jar, 2 milliliters into the Glaciers jar, and the rest, 97 milliliters into the ocean jar. Ask the following:

Where does most of the water you use come from? Why can't we drink and use the Ocean water? How do we use the Ocean water? Where does most of the atmosphere, lakes and streams, and ground water come from?(Ocean evaporation)

Teacher Input:* Have the students develop a cause and effect table as you show them a basic one. List 3 causes and 3 effects by different causes dealing with the water cycle. Tell the students to try an develop eight cause and effect relationships. While we cover the lesson.

Show the students this picture of the water cycle and trace the path of a drop of water through the cycle.

Ask the students why there is runoff - Why doesn't all the water just soak into the ground and become groundwater.Show students examples of runoff, runoff Erosion, Spring Runoff, Forest Fire runoff, Fairbanks flood.

Most of us have collected rainwater runoff to use. Is it safe to drink rainwater? Is it safe to drink rainwater that is running down the road or collected in a puddle? (why, what is the difference) Why can we drink ground water if it has been traveling down through mud and dirt?(natural filter) Is groundwater always safe to drink? (contaminated water, How do you know if water is contaminated? (Testing, contaminated 2, contaminated 3, contaminated 4)) Farms have a big problem with contaminated wells so farmers use a lot of strategies to prevent contamination, manure treatment 1, manure 2, manure 3, manure 4.

Why is the dead sea dead?, Page 257, Red box. Why are lakes that fill with runoff but then just evaporate faster than the water can overflow a lake so the water never runs to the ocean. Show the great salt lake and explain that the lake has no water flowing out all water flows in. Where does the water go? Where do salt and minerals collected by water running into the lake go? How does this affect the water?

Guided Practice:* Students will take turns answering the questions from page 258. Each student will keep track of their water use over the next 24 hours. We will total it up at the beginning of tomorrow's lesson.

Independent Practice:* Students will complete the worksheet, "The Water Cycle"

Check for Understanding:* Students will complete the quiz, "The Water Cycle"

Duration:

30 minutes + 10-15 for Independent Practice (Could be longer if taken for homework).

Alaska Content Standards Addressed in this lesson:

• SCI A-7 Students will understand how the earth changes because of plate tectonics, earthquakes, volcanoes, erosion and deposition, and living things (Processes that Shape the Earth);

• SCI A-15 Students will use science to understand and describe the local environment (Local Knowledge); and: