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| | Home > Agana Heights, Guam, GU, 96910, Agana Heights Real Estate, Agana Heights Yellow Pages, Agana Heights ... (Site not responding. Last check: 2007-09-17) |
 | | An impact crater (impact basin, astrobleme or sometimes crater) is a circular or oval depression on a surface, usually referring to a planet, moon, asteroid, or other celestial body, caused by a collision of a smaller body (meteor) with the surface. |
 | | Few underwater craters have been discovered because of the difficulty of surveying the sea floor; the rapid rate of change of the ocean bottom; and the subduction of the ocean floor into the Earth\'s interior by processes of plate tectonics. |
 | | The distinctive mark of an impact crater is the presence of rock that has undergone shock-metamorphic effects, such as shatter cones, melted rocks, and crystal deformations. |
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