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Martian Craters

Here is a study of the distribution of craters on Mars. There are 3 defined periods of bombardment for Mars and so the surface of Mars has 3 regions.
The article has a link to a discussion of crater forms, with this:
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Certainly the ejecta resembles patterns that one might see throwing rocks into fluid mud, and for this reason these craters are often called "splosh" or "fluidized ejecta" craters. However, one must be careful not to predict the behavior of impactors moving at many kilometers per second from pebbles tossed into mud, and the question of exactly what factors contribute to the form of these ejecta patterns must wait for the further exploration of the planet.
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Also:
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Some [craters] do resemble those seen on the Moon -- for example, those smaller than 5 km in diameter are usually bowl-shaped, with raised rims and slightly flat floors, just like similarly sized craters on the Moon.
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In general, the more craters appear on a surface, the older that surface is. But like most principles in the real world, that rule must be applied with caution.
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On April 26 I had posted about round craters, though mostly about those on the Moon. They appear electrical in nature, not explosions upon impact.
This description of Martian craters brings in water under the surface to explain the varying terrain around the craters. No water is involved in forming lunar craters. There are similar crater types on Mars and Moon.

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