The student will demonstrate an understanding of Earth and

Space systems.

TAKS Objective 5

water carbon nitrogen

Predict the results of modifying the Earth’s nitrogen, water and

carbon cycles

TEKS 8.12 C

water carbon nitrogen

1. The student will summarize the effects of human activity on the

water cycle: global warming, water quality and water quantity

Lesson Objective

water carbon nitrogen

The

Water Cycle

True of False: There is plenty of water

Question

water carbon nitrogen

There is a limited supply of potable water on earth.

Earth's Water Supply

Earth’s Water

Extreme Water

water carbon nitrogen

Engage

• Use the textbook or pictures from the internet to show students– Diminished water quantity– Diminished water quality

Diminished Water Supply

ExploreThe Environmental Protection Agency

• Answer the following questions4. Where is water stored?

5. How does water move from one place to another?

6. What is infiltration?

7. What is runoff?

8. How does global warming affect the water cycle? Use information about the effect of (a) the wet cycle and (b) the dry cycle.

Explain

• Debrief

• Review questions related to the EPA water cycle animated video clip

Where is water stored?

Water is stored in oceans, lakes, rivers, and groundwater.

How does water move from one place to another?

Evaporation, transpiration, condensation, precipitation.

What is infiltration?

Infiltration is water movement between the spaces in the soil.

What is runoff?• Runoff occurs

when water flows over the ground instead of sinking into the ground.

How does global

warming affect the water cycle?

Include information about the effect of:

a) The wet cycle

b) The dry cycle

Global Global warming intensifies the water cycle warming intensifies the water cycle because the earth’s surface is a little warmer and because the earth’s surface is a little warmer and this increases evaporation.this increases evaporation.

a). Where there is too much water, there is more water infiltrating and more runoff. This could cause flooding and negative effects on plants and animals living in the area.

b). In areas away from a water source more evaporation and transpiration could dry out the soil. This could lead to lowered ground water supply, and have negative effects on the plants and animals living in the area.

Elaborate

• Create a diagram showing the effects of global warming on the water cycle.

Evaluate

• Summarize the effects of human activity on the water cycle:

global warming,

water quality,

and quantity.