Weathering and erosion tend to level out crater features, whether impact or volcanic, over time. The atmosphere also protects the surface from many meteor impact events, by burning them up before they strike.
About 71.1% of earths surface is covered by the ocean.
I think it is 75 % of the earths surface is covered by limestone
Mercury
Mercury
about one fourth
crater
Mercury
Mercury
Mercury
205%
28 %
Approximately 30% of the Earth's surface is covered by land, the remaining 70% of the surface is covered by water.