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symbo symbo
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7 years ago
The unstable chemicals dissolved in the Martian regolith suggest that the amount of ultraviolet radiation reaching the surface of Mars is much greater than that reaching the surface of the Earth.  This is because the Martian atmosphere lacks what constituent in sufficient quantities to absorb incoming ultraviolet radiation?
   A)  Oxygen    B)  Ozone    C)  Carbon dioxide    D)  Nitrogen
Textbook 
Discovering the Universe

Discovering the Universe


Edition: 7th
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papachulopapachulo
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7 years ago
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this is exactly what I needed
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