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- Impact_crater abstract "An impact crater is an approximately circular depression in the surface of a planet, moon, or other solid body in the Solar System or elsewhere, formed by the hypervelocity impact of a smaller body with the surface. In contrast to volcanic craters, which result from explosion or internal collapse, impact craters typically have raised rims and floors that are lower in elevation than the surrounding terrain. Impact craters range from small, simple, bowl-shaped depressions to large, complex, multi-ringed impact basins. Meteor Crater is perhaps the best-known example of a small impact crater on Earth.Impact craters are the dominant geographic features on many solid Solar System objects including the Moon, Mercury, Callisto, Ganymede and most small moons and asteroids. On other planets and moons that experience more active surface geological processes, such as Earth, Venus, Mars, Europa, Io and Titan, visible impact craters are less common because they become eroded, buried or transformed by tectonics over time. Where such processes have destroyed most of the original crater topography, the terms impact structure or astrobleme are more commonly used. In early literature, before the significance of impact cratering was widely recognised, the terms cryptoexplosion or cryptovolcanic structure were often used to describe what are now recognised as impact-related features on Earth.The cratering records of very old surfaces, such as Mercury, the Moon, and the southern highlands of Mars, record a period of intense early bombardment in the inner Solar System around 3.9 billion years ago. The rate of crater production on Earth has since been considerably lower, but it is appreciable nonetheless; Earth experiences from one to three impacts large enough to produce a 20 km diameter crater about once every million years on average. This indicates that there should be far more relatively young craters on the planet than have been discovered so far. The cratering rate in the inner solar system fluctuates as a consequence of collisions in the asteroid belt that create a family of fragments that are often sent cascading into the inner solar system. Formed in a collision 160 million years ago, the Baptistina family of asteroids is thought to have caused a large spike in the impact rate, perhaps causing the Chicxulub impact that may have triggered the extinction of the non-avian dinosaurs 66 million years ago. Note that the rate of impact cratering in the outer Solar System could be different from the inner Solar System.Although Earth's active surface processes quickly destroy the impact record, about 170 terrestrial impact craters have been identified. These range in diameter from a few tens of meters up to about 300 km, and they range in age from recent times (e.g. the Sikhote-Alin craters in Russia whose creation were witnessed in 1947) to more than two billion years, though most are less than 500 million years old because geological processes tend to obliterate older craters. They are also selectively found in the stable interior regions of continents. Few undersea 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 Earth's interior by processes of plate tectonics.Impact craters are not to be confused with landforms that in some cases appear similar, including calderas and ring dikes.".
- Impact_crater thumbnail Iapetus_as_seen_by_the_Cassini_probe_-_20071008.jpg?width=300.
- Impact_crater wikiPageExternalLink impact.scaredycatfilms.com.
- Impact_crater wikiPageExternalLink 0003669.000.html.
- Impact_crater wikiPageExternalLink www.krateris.eu.
- Impact_crater wikiPageExternalLink craters.
- Impact_crater wikiPageExternalLink index.html.
- Impact_crater wikiPageExternalLink tercrate.htm.
- Impact_crater wikiPageExternalLink ImpactDatabase.
- Impact_crater wikiPageID "6416".
- Impact_crater wikiPageLength "35235".
- Impact_crater wikiPageOutDegree "229".
- Impact_crater wikiPageRevisionID "705596500".
- Impact_crater wikiPageWikiLink Acceleration.
- Impact_crater wikiPageWikiLink Apollo_(crater).
- Impact_crater wikiPageWikiLink Apollo_program.
- Impact_crater wikiPageWikiLink Argyre_Planitia.
- Impact_crater wikiPageWikiLink Arizona.
- Impact_crater wikiPageWikiLink Asgard_(crater).
- Impact_crater wikiPageWikiLink Asteroid.
- Impact_crater wikiPageWikiLink Atmosphere.
- Impact_crater wikiPageWikiLink Baptistina_family.
- Impact_crater wikiPageWikiLink Beethoven_(crater).
- Impact_crater wikiPageWikiLink Breccia.
- Impact_crater wikiPageWikiLink Caldera.
- Impact_crater wikiPageWikiLink Callisto_(moon).
- Impact_crater wikiPageWikiLink Caloris_Basin.
- Impact_crater wikiPageWikiLink Canada.
- Impact_crater wikiPageWikiLink Carlyle_Smith_Beals.
- Impact_crater wikiPageWikiLink Category:Articles_containing_video_clips.
- Impact_crater wikiPageWikiLink Category:Depressions_(geology).
- Impact_crater wikiPageWikiLink Category:Impact_craters.
- Impact_crater wikiPageWikiLink Category:Impact_geology.
- Impact_crater wikiPageWikiLink Category:Lunar_science.
- Impact_crater wikiPageWikiLink Chesapeake_Bay_impact_crater.
- Impact_crater wikiPageWikiLink Chicxulub_crater.
- Impact_crater wikiPageWikiLink Clastic_rock.
- Impact_crater wikiPageWikiLink Claude_C._Albritton_Jr..
- Impact_crater wikiPageWikiLink Clearwater_Lakes.
- Impact_crater wikiPageWikiLink Coesite.
- Impact_crater wikiPageWikiLink Collision.
- Impact_crater wikiPageWikiLink Comet_Shoemaker–Levy_9.
- Impact_crater wikiPageWikiLink Complex_crater.
- Impact_crater wikiPageWikiLink Compression_(physics).
- Impact_crater wikiPageWikiLink Craton.
- Impact_crater wikiPageWikiLink Cretaceous–Paleogene_extinction_event.
- Impact_crater wikiPageWikiLink Cryptoexplosion.
- Impact_crater wikiPageWikiLink Daniel_Barringer_(geologist).
- Impact_crater wikiPageWikiLink Decorah_crater.
- Impact_crater wikiPageWikiLink Depression_(geology).
- Impact_crater wikiPageWikiLink Dione_(moon).
- Impact_crater wikiPageWikiLink Dominion_Observatory.
- Impact_crater wikiPageWikiLink Dostoevskij_(crater).
- Impact_crater wikiPageWikiLink Earth.
- Impact_crater wikiPageWikiLink Earth_Impact_Database.
- Impact_crater wikiPageWikiLink Ejecta.
- Impact_crater wikiPageWikiLink Energy_density.
- Impact_crater wikiPageWikiLink Engelier_(crater).
- Impact_crater wikiPageWikiLink Epigeus_(crater).
- Impact_crater wikiPageWikiLink Erosion.
- Impact_crater wikiPageWikiLink Escape_velocity.
- Impact_crater wikiPageWikiLink Eugene_Merle_Shoemaker.
- Impact_crater wikiPageWikiLink Europa_(moon).
- Impact_crater wikiPageWikiLink Evaporation.
- Impact_crater wikiPageWikiLink Explosion.
- Impact_crater wikiPageWikiLink Explosive_material.
- Impact_crater wikiPageWikiLink Falsaron_(crater).
- Impact_crater wikiPageWikiLink File:Iapetus_as_seen_by_the_Cassini_probe_-_20071008.jpg.
- Impact_crater wikiPageWikiLink File:Valhalla_crater_on_Callisto.jpg.
- Impact_crater wikiPageWikiLink Ganymede_(moon).
- Impact_crater wikiPageWikiLink Gerin_(crater).
- Impact_crater wikiPageWikiLink Germany.
- Impact_crater wikiPageWikiLink Gertrude_(crater).
- Impact_crater wikiPageWikiLink Goethe_Basin.
- Impact_crater wikiPageWikiLink Gosses_Bluff_crater.
- Impact_crater wikiPageWikiLink Haughton_impact_crater.
- Impact_crater wikiPageWikiLink Hellas_Planitia.
- Impact_crater wikiPageWikiLink Herschel_(Mimantean_crater).
- Impact_crater wikiPageWikiLink Hertzsprung_(crater).
- Impact_crater wikiPageWikiLink Huygens_(crater).
- Impact_crater wikiPageWikiLink Hyperion_(moon).
- Impact_crater wikiPageWikiLink Hypervelocity.
- Impact_crater wikiPageWikiLink Iapetus_(moon).
- Impact_crater wikiPageWikiLink Impact_depth.
- Impact_crater wikiPageWikiLink Impact_event.
- Impact_crater wikiPageWikiLink Impact_structure.
- Impact_crater wikiPageWikiLink Io_(moon).
- Impact_crater wikiPageWikiLink Isidis_Planitia.
- Impact_crater wikiPageWikiLink John_D._Boon_(geologist).
- Impact_crater wikiPageWikiLink Kaali_crater.
- Impact_crater wikiPageWikiLink Karakul_(Tajikistan).
- Impact_crater wikiPageWikiLink Kerwan_(crater).
- Impact_crater wikiPageWikiLink Korolev_(lunar_crater).
- Impact_crater wikiPageWikiLink Lake_Tai.
- Impact_crater wikiPageWikiLink Lakes_on_Mars.
- Impact_crater wikiPageWikiLink Late_Heavy_Bombardment.
- Impact_crater wikiPageWikiLink List_of_craters_on_Callisto.
- Impact_crater wikiPageWikiLink List_of_craters_on_Europa.
- Impact_crater wikiPageWikiLink List_of_craters_on_Ganymede.
- Impact_crater wikiPageWikiLink List_of_craters_on_Mars.