When considering future landing sites, what is a potential downside of the maria's surface rock compared to the highlands?

Answer

The basaltic rock is generally harder and more abrasive

While maria offer flatter terrain, the basaltic rock itself is described as being harder and more abrasive than the anorthosite found in the lighter highland areas.

When considering future landing sites, what is a potential downside of the maria's surface rock compared to the highlands?
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