A the darker terrain left b the lighter terrain right

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Unformatted text preview: of Earth’s moon ‣ Composition: 50/50 heavily cratered regions (30%) ‣ Lighter, grooved terrain, richer in water ice (70%) NASA/JPL rock/ice ‣ Surface: two terrains ‣ Dark, Image of Ganymede taken by the Galileo probe 22 Darker regions are heavily cratered The lighter regions show long grooves, probably from ice-tectonic stresses Thought QuesTon Which of Ganymede’s terrains is older? A. The darker terrain (left) B. The lighter terrain (right) NASA/JPL/DLR Answer: A is more heavily cratered and therefore older A B 23 Terrain A (darker terrain) is more heavily cratered and therefore older. Younger surfaces about as old as the Moon’s maria. Callisto ‣ Heavily cratered iceball ‣ Furthest of the Galilean moons from Jupiter ‣ Little tidal heating from Jupiter surface, no recent geological activity NASA/JPL/DLR ‣ Ancient Image of Callisto taken by the Galileo probe 24 Furthest of the Galilean Moons from Jupiter Bright scars on a darker surface testify to a long history of impacts on Jupiter's m...
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