Labels:lemon | monitor | sky | tv OCR: SPH ER E The outermost or topmost portion of the atmosphere Its lower boundary is the critical level escape variousi estimated 500 1000 m above the Earth's surface. Also called region of escape because high Exosphere velocity atoms and molecules continually escape the gravity lonosphere Mesospher Stratosphere Ozone Troposphere 1000km Thermosphere Mesosphere Tropoepher
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