4. COMMUNITIES BEGAN TO USE ENERGY (II)

Early Egyptians collected oil that floated to the top of ponds. They burned the oil for light. American Indians burned coal to bake clay pots. Ancient Chinese used natural gas to heat sea water for salt. They piped the gas from shallow wells. At about the same time, people began using geothermal energy. They piped water from hot springs into their houses for heat.

People were learning how to use many different energy sources. But until 150 years ago, the sun and wood provided most of the energy. In many parts of the world, they still do today.

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