AST101H1 Lecture Notes - Lecture 14: Strong Gravity, Continental Crust, Oceanic Crust
3 Oct 2016
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On earth the crust floats on the semi-liquid mantle. The continental crust is less dense than the oceanic crust. Drives oceanic plates apart, creating new crust where the cells pushes up. Drives continental plates down under continental ones where cells pull down. Rainfall erodes rock on land; rivers carry broken-down minerals to the sea. Earth"s greenhouse affect will cool earth down: too warm, more precipitation, more co2 from atmosphere dissolves into rain water, co2 concentration decreases in the atmophere. 5. the result is the earth gets cooled. Venus"s plate tectonics seemed to have vanished long ago. This means that there is no carbon cycle to regulate the temperature. Mar"s atmosphere is too thin to absorb heat due to it"s low mass. Does not hold onto gas very well. There is also water in low lying craters. The phoenix mars lander discovered that water once flowed freely there.
