crater
A crater is a topography created by a celestial collision and the like. Typically, it consists of a circular basin and a rim which is an annular mountain range surrounding it, but in reality there are various forms. Although it can be made mainly by collision of meteorite, comet, asteroid, mini planet, etc., similar terrain can be formed by explosion such as nuclear explosion and massive explosive. In Greek, the word "bowl" "dish" is a word origin, originally refers to a circular recessed part regardless of cause, including the crater of the volcano and the hole caused by sedimentation. In English literature, there are not many uses in such a meaning. The scientific name of Coppa is Crater (crater), which is the same etymology. ...