What Appears to Be the Origin of the Light, Grooved

question 313

Multiple Choice

What appears to be the origin of the light, grooved terrain on the surface of Ganymede?

• A) impacts by cometary debris
• B) cracking of the surface caused by shrinkage of the moon as it cooled
• C) cracking of the icy surface, releasing water that expanded as it froze into ice
• D) flow of water on the solid surface of the moon at some time in the past, which subsequently shrank as it froze into this distinctive terrain

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