Why Is Galileo Regio, the Large Circular Feature on Ganymede

question 67

Multiple Choice

Why is Galileo Regio, the large circular feature on Ganymede, so dark?

• A)It is composed of dense basaltic mantle rock that once flowed like lunar mare.
• B)It is the result of micrometeorite dust settling onto it over several billion years.
• C)It has an asphalt-like material that is like the dark side of Iapetus of Saturn.
• D)It is the result of ultraviolet light from the Sun interacting with the ice and creating asubstance that is quite dark.
• E)It is the site of a recent meteorite impact that scattered a lot of dark, rocky material.

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