Heat is a. form of energy. Heat flows from hot objects to cool objects. It flows from one object to another because of their difference in temperature. The cool object absorbs the energy and becomes warmer.
People and other animals can see because there is light. Light is a form of energy. The Sun is a very important source of light energy. Without the energy from the Sun, there would be no plants or animals on Earth’s surface.
Besides the Sun, other sources provide light. Burning objects give off light. So do some animals, such as fireflies and certain fish. Lightning and electric lightbulbs also produce light.
Electricity is the flow of tiny particles called electrons and protons. It can also mean the energy you get when electrons flow from place to place. Electricity can be seen in nature in a bolt of lightning. Lightning is nothing but a large number of electrons flowing through air all at once, releasing a huge amount of energy. Scientists have also learned how to generate, or create, electricity.
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