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Unformatted text preview: ball shape is not constant but waxes and wanes (flexes) as the gravity differential changes along Io’s orbit. This flexing heats Io’s interior by shear friction. The situation is prevented from damping out (Io’s orbital eccentricity is maintained) by resonances with Europa and Ganymede. Io: Volcanic Activity Plumes such as the one below imaged along the limb of Io provide clear evidence that Io is volcanically active. Io: Volcanic Activity Io’s surface is devoid of impact craters and must therefore be very young. Resurfacing (renewal of the surface) is very active on Io. The multicolored deposits on Io are due to various sulfur­rich compounds emplaced by Io’s volcanic activity. Bright white deposits are due to SO2 (sulfur dioxide) frost. There is no evidence for H2O on Io. Io’s initial endowment in H2O must now be gone. The H escaped and the O recombined with sulfur S to form SO 2. Io: Volcanic Activity Io: Volcanic Activity Between 1979 and 1981: patterns of volcanic deposits clearly changed as well. Io: Hot Spots As a result of tidal heating, Io experiences volcanic activity on a global sca...
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This note was uploaded on 11/10/2011 for the course GEOL 380 taught by Professor Mcsween during the Spring '11 term at University of Tennessee.

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