Crater density used relative dating
Approximately 80% of Earth's surface is less than 200 million years old, while over 99% of the Moon's surface is more than 3 billion years old.Essentially, the Moon's surface has not been modified since early in its history, so most of its craters are still visible. Barringer Crater (Meteor Crater) in Arizona, United States, is a simple crater created when a 50-meter-wide (160-foot-wide) iron-rich meteroid struck Earth's surface about 50,000 years ago — a very recent event to a geologist.On Earth, impact craters are harder to recognize because of weathering and erosion of its surface.The Moon lacks water, an atmosphere, and tectonic activity, three forces that erode Earth's surface and erase all but the most recent impacts.Copernicus is a large crater (93 kilometers or 60 miles wide) on the Moon. This crater is about 20 kilometers (12 miles) across and has a large central peak and terraces around its rim.
are very large impact structures that are more than 300 kilometers (185 miles) in diameter.
The impactor is shattered into small pieces and may melt or vaporize.
Sometimes the force of the impact is great enough to melt some of the local rock.
Venus has fewer craters; its surface has been covered recently (in the last 500 million years! Much of Earth's surface is recycled through plate tectonic activity (and erosion), so Earth also has few craters.
Why does the Moon have so many craters while Earth has so few?