GEO 303 Lecture Notes - Lecture 24: Olympus Mons, Valles Marineris, Mariner 4
21 Dec 2017
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Lecture 24: venus, mars, and plate tectonics: runaway greenhouse effect. Subduction of calcite into the mantle removes carbon from the surface. The slow rotation of venus isn"t the whole reason for its lack of a magnetic field. Mercury rotates very slowly, but it does have a magnetic field. The lack of plate tectonics slows the rate of eat loss from the interior helps drive. No water no carbon cycle runaway greenhouse no plate tectonics slow heat loss. In the absence of a protective magnetic field, the solar wind will blow the hydrogen convection in the core from interior no thermal convection in core no geodynamo . (h 2 o h + oh) into space, slowly drying out the atm. The sun was initially much cooler than it is now, so venus was likely similar to earth. Over a period of ~600 million years, venus lost its water, & once the water was gone,
