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The sun is the source of all life on our earth. Every form of energy, except for atomic energy, can be traced back to the sun. Happily, the earth is at the best possible distance from the sun for the sun's heat to provide this energy for life. Energy from sunlight is used by plants to make food from air, water, and the minerals in the soil. This energy is stored by plants who are the primary producers in ecosystems.
Energy sources such as the fossil fuels of coal, petroleum, and natural gas are really just ancient stockpiles of the sun's energy stored in plants and the animals that ate those plants that are thousands or millions of years old. These fuels came from plants that used sunlight when they lived long ago. When these plants died, they fell to the ground where their remains piled up over thousands or millions of years. As this pile grew large, the remains at the very bottom became pressed together. Over time, these remains changed. Some became a gas--natural gas. Some became a liquid--petroleum. Some became a solid or a rock--coal. We use these forms of energy to power vehicles, heat homes, and run industries. Fossil fuels are considered nonrenewable sources of energy because they cannot be replaced once they are used up.
Sample some of the following activities to learn more about different energy cycles.
Places To Go 
People
To See Things To Do Teacher
Resources Bibliography
Places To GoThe following are places to go (some real and some virtual) to find out about energy cycles.
Dams have been constructed around the world to divert the flow of a river into hydroelectric power plants. Turbines and generators inside the plant are used to change water from mechanical energy into electrical energy.
Go to the Have-A-Bite Cafe and order a meal. The website will tell you if you have chosen wisely. Assume the role of Inspector Snarfengood and play the Nutrition Sleuth game.
Virtually visit the sun. The sun makes all life on our planet possible. It provides energy for everything on earth.
People To SeeMeet the Atoms Family and learn about energy conservation. Dabble in kinetic and potential energy.
Benjamin Franklin was interested in energy in the form of electricity. Find out more about his famous kite-and-key experiment in June of 1752.
Visit with a turkey vulture. Vultures are sometimes called buzzards. Buzzards play a key role in the energy cycle by feeding on the carcasses of dead animals.
Talk with Wendell the Worm. Earthworms are one of nature's best recyclers, and decomposers are an important part of food webs.
Things To DoHow does solar power compare to wind power or to refuse-based power? What are the advantages and disadvantages of coal power and nuclear power. Find out here.
Check out the educator links at this Dole site. It has lesson plans, games, and activities that teach students about the importance of good nutrition.
The energy we use comes from different energy sources. These sources are divided into two groups -- renewable and nonrenewable.
Click around this interactive site to learn about how energy works, to read the weekly energy news, and to get to know famous super scientists.
Find out how energy is one of the most fundamental parts of our universe.
Find out what people throughout history ate. When was popcorn first eaten? When was Spam first eaten?
Food choices influence energy levels. Print out the reproducible activity book from this site that helps students make wise food choices.
Ever wonder what, exactly, you are putting in your body when you eat? Would you like to know the real difference between a "fat" and a "carb"? Learn all about food and how your body uses it!
Batteries are all over the place -- in our cars, our PCs, laptops, portable MP3 players and cell phones. A battery is essentially a can full of chemicals that produce electrons.
Ice cream is an important part of the energy cycle for all Americans. The average American eats about a ton of ice cream in his or her lifetime. Americans eat more ice cream than any other people in the world.
Get the science and the stories behind the bolts that strike our Earth a hundred times every second.
According NASA, astronauts select their menus approximately five months before their flight. The menus are analyzed for nutritional content and corrections are made to any nutrient deficiencies based on the Recommended Dietary Allowances.
Learn about the benefits of wind power from the National Wind Technology Center (NWTC).
Explore the food pyramid, print out food pyramids for students, use a reader's theatre format to teach about nutrition.
Figure out the energy that comes from rubbing your feet on carpet.
Discover the power of the wind. Meet Vollis Simpson and his windmill-powered whirligigs.
Digestion is the process by which food is changed into substances that can be absorbed and used by the body. It's a transfer of energy from the food that you eat.
Teacher Resources
Bibliography- Ganeri, Anita. The Hunt for Food. Brookfield, Conn.: Millbrook Press, 1997.
- Kalman, Bobbie. What Are Food Chains and Webs? New York: Crabtree Pub. Co., c1998.
- Lauber, Patricia. Who Eats What?: Food Chains and Food Webs. New York, NY: HarperCollins, c1995.
- Maynard, Jacqui. I Know Where My Food Goes. Cambridge, Mass.: Candlewick Press, 1999.
- Riley, Peter D. Food Chains. New York: Franklin Watts, 1998.