Labels:convex polyhedron | crt screen | 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 Thermosphere lonosphere Mesospherc Stratosphere Ozone Troposphere Mesosphere
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