Why have the lunar highlands remained largely unchanged for billions of years?

Answer

Lack of wind, water, and plate tectonics

The lunar highlands are the oldest parts of the lunar crust and are heavily cratered. These features have been preserved for billions of years because the Moon does not have wind, liquid water, or active plate tectonics, which are the primary geological forces that erode and modify planetary surfaces over time.

Why have the lunar highlands remained largely unchanged for billions of years?

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