crater causes

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From: Coral Clark (coralc@exploratorium.edu)
Date: Tue Sep 25 2001 - 08:41:14 PDT 

Date: Tue, 25 Sep 2001 08:41:14 -0700
From: Coral Clark <coralc@exploratorium.edu>
Subject: crater causes
Message-id: <p04320403b7d6542b25cc@[10.0.1.47]>

Craters on planets (including Earth) are caused by impacts by small
pieces of matter from space, either asteroids or comet fragments.
This material is left over from the formation of the Solar System.
For more information on impacters, check out this link:

http://spacelink.nasa.gov/Instructional.Materials/Curriculum.Support/Space.Science/.index.html

Click on "near Earth impact hazards"

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