2500-15-large satellites
2500-15-large satellites
2500-15-large satellites
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Ganymede - Indications of Internal Activity<br />
Several Diverse Terrains Appear in This Galileo Image<br />
• Oldest Area (right) Consists of Rolling Hills with Many Craters<br />
• Intermediate Age (Left) Displays a Dense Pattern of Folded<br />
Mountains (Not Tectonic Compression – Rather Uplift-Downdrop<br />
Along Faults - Valleys Flooded by Waters from the Interior)<br />
• Youngest (Center) Displays Smooth Terrain<br />
with Numerous Craters<br />
(Craters Suggest that Surface Is at Least 2 Billion Years Old)<br />
Note: This Is a Single Picture – Not a Montage of Three Separate Images