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Renewable energy resource: an energy resource that is replaced rapidly by natural processes. Some examples of renewable energy resources are sunlight, hydropower (water falling through a dam), and wood. When you use some sunlight to warm your back, more is made almost immediately available. Water above the dam is continually replaced by rainfall. If you chop down a tree and burn its wood in your campfire, it takes awhile for the forest to grow enough to replace that wood, but it will happen within your lifetime.