The depth of any crater in a solid planet or moon - whether it is an impact crater, a volcanic crater, or a subsidence crater - may be measured from the local surface to the bottom of the crater, or from the rim of the crater to the bottom. A planet is generally considered to be a relatively large mass of accreted matter in orbit around a star that is not a star itself. ... Moons of solar system scaled to Earths Moon The common noun moon (not capitalized) is used to mean any natural satellite of the other planets. ... Tycho crater on Earths moon. ... Perhaps the most conspicuous part of a volcano is the crater, a basin of a roughly circular form within which occurs a vent (or vents) from which magma erupts as gases, lava, and ejecta. ... Post-shot subsidence crater and Huron King test chamber, which was less than 20 kilotons (1980) A subsidence crater is the crater left on the surface of an area which has had an underground (usually nuclear) explosion. ... Look up rim in Wiktionary, the free dictionary. ...

Image File history File links This is a diagram intended to show that the depth of a crater can be measured either from the local surface or the height of the rim. ...

The diagram above shows the full (side) view of a typical crater. Depth "A" measures from the surface to the bottom of the crater. Depth "B" measures from the mean height of the rim to the bottom of the crater.