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2500-15-large satellites

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<strong>15</strong>.7 Comparing the Large Satellites<br />

Ganymede<br />

• These Factors Are Small – But Even When Taken Together - They<br />

Would Not Produce Differentiation on Their Own<br />

• Rather - They Triggered a Major Change in Another Internal<br />

Process – Possibly Upper Mantle Convection<br />

• Sufficient to Drive Early Plate Tectonics for 1 Billion Years<br />

• Finally - Cooling Produced a Phase Change of Interior Liquid<br />

Water to Solid Ice - Crust Cracked with Minor Mountain Building<br />

Shown to Scale in this Composite Galileo Photograph

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