Meteors also create impact craters and surrounding ridges. Massive basaltic eruptions took place generally at the base of large impact craters. Noachian terrains consist of overlapping and interbedded ejecta blankets of many old craters. Alternatively smooth plains may be ejecta blankets of the nearby impact craters. Few meteorites are large enough to create large impact craters. Venus has many craters and canyons on its surface. At first, it was pockmarks, like small craters from impacts. This is one of the largest-known meteorite impact craters on Earth. Kaali is a small group of nine unique meteorite craters on Saaremaa. One of the biggest lunar craters, Apollo, is named after Apollo missions. This is where most of the large craters and basins are located. It is one of a handful of lunar craters named after women. Mars is also scarred by countless impact craters. Its surface is completely covered with impact craters. This is a list of named lunar craters.