An ejecta blanket is a generally symmetrical apron of ejecta that surrounds a crater; it is layered thickly at the crater’s rim and thin to discontinuous at the blanket’s outer edge. After an impact event, the falling debris forms an ejecta blanket surrounding the crater. Approximately half the volume of ejecta falls within 1 crater radius of ...
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http://en.wikipedia.org/wiki/Ejecta_blanket
(from the article `Mercury`) Two types of terrain surround Caloris—the basin rim and the basin ejecta terrains. The rim consists of a ring of irregular mountain blocks ... ...thousands of square kilometres. The outer rings of the basins are clifflike scarps that face inward. Because of the gradation of smaller examples ... [2 re...
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http://www.britannica.com/eb/a-z/e/15
The 4-km-diameter crater Linne in the western part of Mare Serenitatis on the Moon. This Apollo 15 photo shows the bright ejecta blanket surrounding this relatively very young crater. Image credit: NASA A generally symmetrical apron of ejecta that surrounds an impact crater. It is layered thickl...
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http://www.daviddarling.info/encyclopedia/E/ejecta_blanket.html
Rock material (crushed rock, large blocks, breccia, and dust) ejected from an impact crater or explosion crater and deposited over the surrounding area.
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http://www.evcforum.net/WebPages/Glossary_Geology.html
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