ocr: ATMOSPHERE Exosphere Composition 230 km The Martian atmosphere, like the Earth's, is composed of gases released from the interior through volcanic activity. Mars' atmosphere is 95% carbon dioxide, 2%1 nitrogen, and 1.6% argon. In addition, traces of water vapor, carbon monoxide, oxygen, ozone, krypton, neon, and xenon are present. Unlike Earth, the Mars has no ozone layer, which means the planet's surface Thermosphere is fully exposed to ultraviolet radiation. 130 km The atmosphere of Mars is tenuous; the surface pressure is less than 1% of the Earth's. Because the atmosphere is so' thin, it c ...
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