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Unformatted text preview: ASTRO EXAM 2 How to remove Co2 from an atmosphere- if liquid water is present 1) requires no life* silicates converted to carbonates (found in predominant rocks) magnesium silicate + carbon dioxide magnesium carbonate + silicon dioxide (quartz) 2) requires life* animals contribute in removal process-shells are calcium carbonate- animal shells-animals die, sediments buried and compressed into rock- limestone If Earth trapped CO2 in carbonates and limestone’s were released, earths atmosphere would increase 100X like venus Ozone layer in stratosphere , absorbs ultraviolet radiation (sunburn) damages skin-chlorofluorocarbons can break apart ozone ASTEROIDS-brightness changes as it rotates because different surface features scatter different amounts of light. VENUS- thick acidic atmosphere, very hot, no liquid water EARTH- nitrogen and oxygen, keeps it to a comfortable temperature with liquid water, crust broken into ten plates that more on the mantle underneath MARS- thin and wispy atmosphere, mostly CO2, near or below freezing point...
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- Spring '07
- Planet, liquid water