Precipitation, evaporation, and transpiration are all terms that sound familiar, yet may not mean much to you. They are all part of the water cycle, a complex process that not only gives us water to drink, fish to eat, but also weather patterns that help grow our crops.
Water is an integral part of life on this planet. It is an odorless, tasteless, substance that covers more than three-fourths of the Earth's surface. Most of the water on Earth, 97% to be exact, is salt water found in the oceans. We can not drink salt water or use it for crops because of the salt content. We can remove salt from ocean water, but the process is very expensive.
The amount of fresh water on earth is only 3%. Two percent is in solid form, found in ice caps and glaciers. Because it is frozen and so far away, the fresh water in ice caps is not available for use by people or plants. That leaves about 1% of all the Earth's water in a form useable to humans. This fresh water is found in lakes, rivers, streams, ponds, and in the ground. (A small amount of water is found as vapor in the atmosphere.)
1. Where does rain come from?
2. How does the rain get into a cloud?
3. What is a cycle?
4. What happens to water from puddles?
5. What is the first stage of the water cycle called?
6. What is the second stage of the water cycle called?
7. What do you notice?
8. What do you predict will happen to the cups of water? Will they have
the same amount of water tomorrow?
9. Which cup will take longer to evaporate?
10. Who can describe the water cycle?
11. Who would like to share what they learned about the water cycle?
1. Water Cycle Diagram
2. Electric Skillet demonstration
3. Water Cups evaporation experiment
10. Closure: To close the lesson I will ask for volunteers to share something they have learned about the water cycle.
11. Individualization: For the most part this lesson is a group discussion. I will make every effort to...