Energy makes thing happen. Without it, the entire Universe would be cold and dark, and nothing would be able to move. There are many kinds of energy, including heat, light sound and electricity. Each time we use energy, it changes from one form into others. For example, when you turn on a light, electrical energy is changed into light and heat, and when you flick the pages of this book, chemical energy from the food you eat is changed into movement.
Energy from the Earth
Plants need sunshine to grow, and animals need plants for food. If the Sun went out tomorrow, plants and animals would should die, but some bacteria would still survive because they get their energy from chemicals inside the Earth. They live in hot springs and deep-sea vents (holes in the Earth's crust) where water brings the chemicals to the surface.
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