Earth is a spaceship. It travels at 250 kilometers per second. It has an outer hull and a force field protecting its occupants from space radiation. Its engine is remotely placed some 93,000 million miles away that sends power in the form of light and heat. Earth's internal generator provides additional heat, magnetic and electrical energy. Its life support system, the biosphere, provides everything its occupants need: oxygen, food, water, waste control. The biosphere is a complex system working with basic chemical elements in a medium primarily of water.
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inspiration for the budding environmentalist
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