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OCR: ATMOSPH JERE Exosphere "HE LAYERS of gas that surround - planet or stat Atmospheric are called its atmosphere The layers Earth atmos sphere stretches Earth's for 620 miles (1 000 km) atmosphere and provides us with air divided into five water, warmth. and protection main layers. from the sun' harmful rays. The farther you are away from the Earth. Thermosp here the less air there the atmosphere Even on the top breathing can become difficult. Stratosphere Driving into space If you could drivea car Ozone upward at31 m.p.h. layer Mesosphere (50 km/b) woula be above the Troposphere exosphere in less than day star atmospbere mountain laver would exospbere