Chris L Peterson wrote:
On Tue, 20 Dec 2005 10:31:42 GMT, Tom Randy wrote:


They are not all round, some are oblong due to strike angle.
Even Meteor crater in Arizona is slightly oblong.


I believe that Meteor Crater was created round, however. Its current odd
shape is the result of erosion: the surrounding rock contains planar
slip zones, and the result has been a slow collapse of the crater walls
producing a squarish shape. Unlike craters on other Solar System bodies,
those on Earth are always altered by weathering and erosion, often
nearly beyond recognition as craters.

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Chris L Peterson
Cloudbait Observatory
http://www.cloudbait.com
You can conduct an experiment by throwing a wet clump of sand
into a wet,loose box of sand.
If you throw it hard,you will see the same as with moon craters,
no matter what the angle is, it will make a round crater,
with a small pile often in the centre, just as you can see
in a number of craters on the moon.Of course if you make an
almost horizontal strike,the outcome may differ,but that
will happen in only very few cases.