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Ring mountains are summetrical craters that have a diameter of 20 to 100 km and have close quarters, terraced inner slopes and circular walls with well defined summits.
Craters with flooded floors that are 5 to 200 km wide are flooded by lava because of the craters original formation or by a volcano forming inside of a crater and flooding this crater with lava.
Finally, the smallest craters that can be seen from earth are called crater pits or craterlets, for their small size, 5 km or less, have the same description as craters.