What observational evidence supports the idea that Mercury once shrank by some 20 kilometers in radius?

Name: What observational evidence supports the idea that Mercury once shrank by some 20 kilometers in radius?
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The presence of many long, tall cliffs on Mercury, known as "scarps," is evidence that the planet once shrank by some 20 kilometers in radius. The scarps were likely formed when the planet's interior cooled and contracted, causing the crust to crack and form these cliffs.

What Observational Evidence Supports the Idea That Mercury Once Shrank