Impact Crater (definitions)

The floor of the crater can be bowl shaped or with a central uplift, while around it the walls form a raised rim. The crater is usually surrounded by an ejecta blanket, while its floor is covered with breccia, a course-grained rock, composed of broken rock fragments. During the impact both the target rock and the impactor are melted in what is called impact melt which is then dispersed in various impact deposits and ejecta, including some small particles called tektiles.

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