Raising an impact in Africa

When you look at the Moon, you see a surface covered in craters. Yet the Earth, which is bigger and has more gravity -- and therefore, you'd think, be hit more often than the Moon -- hardly has any craters! The difference, of course, is that the Earth has weather and tectonic activity. Craters erode, and over time go away*. But not all of them do. Some are so big they take hundreds of millions of years to erode, while others are in dry climates where erosion is limited... like, say, in Algeria. Where the Tin Bider crater lies!