Many people ride a bicycle for fun and exercise. Some people ride a bicycle to work because it saves money and benefits the environment by reducing the use of fossil fuels. Which of these is not an example of the bicycle using mechanical energy?

If students could rotate the globe quickly or slowly and the globe could rotate only at the rate that Earth actually rotates, about how long would each complete rotation take?

If a piece of wood is floating at the top of the pitcher with water, that means that the wood is.....

A toaster is powered by electrical energy. The toaster changes the electrical energy to.....

About 50% of the electricity produced in the U.S. is created by burning coal. What form of energy is coal?

A dog rolls over and receives a treat. The dog rolls over again. This is an example of...

Fox squirrels live in the trees of city parks in Texas. Each spring they build nests of twigs and leaves in the tops of trees. They are also often found near park benches, waiting to be fed by visitors. Which of these is a learned behavior?

The spotted fur of a leopard and spotted skin of a leopard gecko are shown in the photographs below. How do these body coverings help organisms in their environments?

Which of these objects is an insulator?

A canyon is formed by...

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