
	Where results make sense

Topic: Meteorite impact

Related Topics

Impact event

Boltysh crater

Impact crater

Silverpit crater

Barringer Crater

Chicxulub Crater

Shocked quartz

Wabar craters

Tunguska event

90377 Sedna

Megaton

Australian words

Mutual assured destruction

Meteoroid

Tsunami

	Terrestrial Impact Craters
		Impact craters are geologic structures formed when a large meteoroid, asteroid or comet smashes into a planet or a satellite.
		The impact basin is buried by several hundred meters of sediment, hiding it from view.
		The Manicouagan impact structure is one of the largest impact craters still preserved on the surface of the Earth.
	www.solarviews.com /eng/tercrate.htm (2505 words)

	Meteorite Stamps and Coins
		One of the minerals, identified as "fer natif" (native iron) appears to be an etched slice of an iron meteorite displaying its Widmanstatten pattern.
		The first sheet (left) depicts a Martian meteorite from India (presumably Shergotty), a Martian meteorite from Nigeria (presumably Zagami), a Howardite from the United States (five are known), the iron meteorite Mundrabilla from Australia, and a mesosiderite from Poland (presumably Lowicz).
		The impact depicted on this sheet possibly represents that at the end of the Cretaceous which may have caused the extinction of the dinosaurs.
	www.pibburns.com /catastro/metstamp.htm (8148 words)

	The Controversy Over Utah's Upheaval Dome
		There are several key pieces of evidence that point to a meteorite impact for the origin of Upheaval Dome.
		It is believed that shatter cones form when shockwaves from a meteorite impact move through the surrounding rock, leaving the grooves behind.
		Even more evidence for the impact theory was presented in 1995 by John Louie, a seismologist at the University of Nevada-Reno.
	www.meteorite.com /impact/upheaval.htm (794 words)

	Impact event - Wikipedia, the free encyclopedia
		Impact events are caused by the collision of large meteoroids, asteroids or comets (generically: bolides) with Earth and may sometimes be followed by mass extinctions of life.
		It was not until 1903–1905 that the Barringer Crater was correctly identified as being an impact crater, and it was not until as recently as 1963 that research by Eugene Merle Shoemaker conclusively proved this hypothesis.
		This has led to the suggestion that the Chicxulub impact was one of several that occurred almost simultaneously, perhaps due to a disrupted comet impacting the Earth in a similar manner to the collision of Comet Shoemaker-Levy 9 with Jupiter in 1994.
	en.wikipedia.org /wiki/Impact_event (3140 words)

	Impact Craters: Research Links for Students
		Impact craters are geologic structures formed when a large meteoroid, asteroid or comet smashes into a planet or a satellite.
		Meteoritic craters are depressions formed by the impact of the meteorite on a planetary body.
		Impact craters are a common feature on most planetary bodies because projectiles (such as meteoroids, asteroids, and comets) have collided with planetary surfaces for billions of years.
	www.cdli.ca /CITE/solar_impact_craters.htm (844 words)

	Arthur Ross Hall of Meteorites \| American Museum of Natural History
		But after more careful study of the meteorites and altered rocks in and around the crater, scientists realized that it must have formed during a massive meteorite impact.
		Meteorite specialist Harvey Nininger discovered them in 1946 by attaching a magnet to the end of a cane and sweeping it around the crater.
		When mining engineer Daniel Barringer first argued in 1906 that an impact formed the crater, he noted that the meteorites and other rock debris around the crater were randomly mixed together in one layer.
	www.amnh.org /exhibitions/permanent/meteorites/impacts/crater.php (843 words)

	Terrestrial Impact Craters Slide Set
		Based on apparent correspondences between periodic variations in the marine extinction record and in the impact record, some scientists suggest that large meteorite impacts might be the metronome that sets the cadence of biological evolution on Earth—an unproven but intriguing hypothesis.
		Three large meteorite impact craters, with diameters of 35 to 65 km surrounded by bright (rough) ejecta blankets, dominate the landscape.
		Impact melts are extremely uniform in their composition but highly variable in texture.
	www.lpi.usra.edu /publications/slidesets/impacts.html (4355 words)

	Lunar Meteorites (Site not responding. Last check: 2007-10-29)
		The main thrust of his argument is that all the lunar meteorites were blasted off the Moon in the last ~20 million years (most in the last few hundred thousand years) and that there haven’t been enough “big” impacts on the Moon in that time to account for all the different lunar meteorites.
		A weathered lunar meteorite would not be an impressive or suspicious looking rock if found in a cornfield or streambed (see Dar al Gani 400 or QUE94281) and a brecciated lunar meteorite could easily be overlooked in the field as a terrestrial sedimentary rock.
		Lunar meteorites that are mare basalts (e.g., NWA 032) or breccias composed mainly of mare material (EET 87521/96008) are poor in aluminum and rich in iron.
	epsc.wustl.edu /admin/resources/moon_meteorites.html (4862 words)

	Ames, Oklahoma, Meteorite Impact Structure (Site not responding. Last check: 2007-10-29)
		The gravity signature of impact craters is relatively distinctive and the relationship between impact effects and density is somewhat straightforward.
		Impact craters formed in sedimentary rocks with a diameter similar to the Ames structure (~15 km) generally produce negative gravity anomalies that extend to or slightly beyond the rim of the crater (Grieve and Pesonen, 1992).
		The density and magnetization models derived from the data are similar to structures obtained from geophysical surveys, geological data, and modeling of known and presumed meteorite impact craters.
	geophysics.ou.edu /ames/index.html (1752 words)

	Coesite, Stishovite, Diamonds, Tektites, Impact Metamophism, and Related Features
		Impact induced mineral assemblages, and partially melted breccia are sure signs of these interstellar bombs, while impact craters and shatter cones represent convincing landforms.
		In other words an impact at 75 degrees is approximately the same as using a diameter 3/4 as big as the original diameter or using a density that is 3/4 the original density of the meteorite.
		Of course not all of a meteorite's energy is used to crater, in fact some of it is used to produce a huge shock wave, and most is lost as latent heat (Melosh, 1985).
	www.umich.edu /~gs265/meteor.htm (3630 words)

	Auburn University Geology Department Virtual Field Trips Wetumpka Impact Structure
		Impact craters are usually caused by meteors that strike the surface of a planet or planetary body.
		Simple impact craters are circular, bowl-shaped depressions with well defined, raised rims and an interior slope that is steepest near the rim and smoothly decreases toward the crater's center.
		According to Koeberl and Anderson 1996, the presence of meteorites or meteorite fragments at an impact crater is possible, although rare.
	www.auburn.edu /academic/science_math/geology/docs/wetumpka/gen.htm (1086 words)

	Meteorite - Wikipedia, the free encyclopedia
		Meteorites have traditionally been divided into three broad categories: stony meteorites are rocks, mainly composed of silicate minerals; iron meteorites are largely composed of metallic iron-nickel; and, stony-iron meteorites contain large amounts of both metallic and rocky material.
		Most meteorite falls are recovered on the basis of eye-witness accounts of the fireball or the actual impact of the object on the ground, or both.
		Apart from meteorites fallen onto the Earth, "Heat Shield Rock" is a meteorite which was found on Mars, and two tiny fragments of asteroids were found among the samples collected on the Moon by Apollo 12 (1969) and Apollo 15 (1971) astronauts [4].
	en.wikipedia.org /wiki/Meteorite (3784 words)

	Meteorite Hunters: Marvin Killgore
		Killgore found a number of iron meteorites with small "craters" in the surface, and McCone was able to argue convincingly that the origin of these was indeed micrometeorite impacts in space.
		Some meteorites annihilate themselves in massive explosions close to the ground, causing flashes of heat that are hot enough to melt the sand into pure glass.
		They are probably the plainest-looking meteorites, but they are among the most interesting because of their possible link to the origins of life.
	www.space.com /peopleinterviews/mkillgore_000503.html (1589 words)

	Nearctica - Geology - Geology - Meteorites and Impact Craters
		This commercial site has a wonderful introduction to meteorites and answers such questions such as what are the types of meteorites, where do they come from, how can you recognize and meteorite, and more.
		An assesment of the hazards of a comet or asteroid impacting the earth.
		An excellent series of lecture notes on the theory that a meteor impact for responsible for the extinction of the dinosaurs and other groups at the end of the Cretaceous.
	www.nearctica.com /geology/meteor.htm (769 words)

	Record meteorite hit Norway - Aftenposten.no
		Røed Ødegaard said the meteorite was visible to an area of several hundred kilometers despite the brightness of the midnight sunlit summer sky.
		Of course the meteorite is not radioactive, but in explosive force we may be able to compare it to the (atomic) bomb," Røed Ødegaard said.
		The astronomer believes the meteorite was a giant rock and probably the largest known to have struck Norway.
	www.aftenposten.no /english/local/article1346411.ece (537 words)

	Shiva: Another K-T Impact?
		Doubt was cast on the impact origin of the Silverpit crater earlier this year, when it was reported in the journal Nature that Silverpit instead may be a sinkhole depression caused by salt withdrawal.
		Koeberl admits that identifying impact craters is neither easy nor straightforward, but he is adamant that Shiva is not an impact crater.
		One indication of an impact origin, he says, is that the floor of the Shiva crater is missing most of the lithosphere - the brittle outer shell of the Earth that includes the crust (the continents and the ocean floor) and the uppermost part of the mantle.
	www.spacedaily.com /news/deepimpact-04r.html (1574 words)

	The Chiemgau-Impact
		The Holocene Tüttensee meteorite impact crater in southeast Germany
		That impact struck the south-east of Bavaria/Germany at some time during the Celtic period and left an extended crater-strewnfield of about 100 craters.
		The unusual pressures, temperatures and mass movements closely related to meteorite impact result in partly drastic changes of the physical properties of the target rocks.
	www.chiemgau-impact.com (839 words)

	Meteorite Impacts
		For meteorites larger than a few hundred tons (which fortunately are quite rare), atmospheric friction has little effect on the velocity and they hit the Earth with the enormous speeds characteristic of their entry into our atmosphere.
		A 12-kilogram stony meteorite (chondrite) from the fireball fell in Peekskill, New York, smashed the trunk of a parked automobile, and came to rest beneath it.
		Thus, it has been proposed that 65 million years ago in what is now Yucatan the impact at a velocity of 11 km/second of a 10-kilometer wide asteroid threw huge amounts of matter into the atmosphere (in addition to local phenomena like generating 2000 foot waves that may have emptied the Gulf of Mexico!).
	csep10.phys.utk.edu /astr161/lect/meteors/impacts.html (845 words)

	Meteorite Impact Reformulated Earth's Crust, Study Shows
		Mungall and other experts studying impact craters, such as this one in Sudbury, Ontario, hope to understand how a period of continual bombardment about four billion years ago shaped the planet.
		David Kring is a planetary scientist at the University of Arizona in Tucson and an authority on impact craters.
		As well, Kring adds, an emerging theory in the field of impact crater research is that the largest of these impact events early in Earth's history may have created the conditions needed for the evolution of life.
	news.nationalgeographic.com /news/2006/01/0112_060112_meteorite.html (481 words)

	Meteorite - Meteorites For Sale - Meteorite Dealers - News & Links
		In other meteorite news we have finished our new meteorites for sale store site and are now in the process of adding our inventory.
		Meteorite Dealers are also sorted alphabetically by business name and by personal name.
		When you find a meteorite by either sight, magnet cane, or metal detector you may also be surprised by the size of your.
	www.meteorite.com (609 words)

	The Boggy Creek Collection of Meteorite Finds
		On the evening of the 31st we had dinner with a scientist who is a pioneer and innovator in the field of Mass Spectrometry, has worked on meteorites, and in fact has worked on the Tunguska Impact Event materials and the Bells meteorite fall of 1961.
		The Boggy Creek Collection of Meteorite Finds is an ambitious project begun as a result of mineral collecting and environmental conservation efforts on private property in Central Texas in 1995, and ending for the time being in 2001.
		We found that over the years, many types of meteorite samples including lunar, asteroidal, anomalous, a stellar grain sample (piece of a collapsed super nova), and extremely rare silicate skeletal remains of cometary debris were found in Boggy Creek.
	www.bccmeteorites.com (1967 words)

	Meteorite Impact Craters
		A quick look at the chart below shows that almost all the 10+ meter craters dated within the last 50,000 years have meteorite fragments associated with them.
		Of those older, only 3 have meteorites and none older than 1 million years.
		It appears the Macha, Russia crater would be a prime target for investigation.
	www.star-bits.com /impact-craters.htm (86 words)

	Ernstson Claudin impact structures
		A comprehensive report on the Rubielos de la Cérida impact basin and crater chain (Spain) including 170 new images (outcrops, impact breccia samples, impact melt rocks, photomicrographs of shock metamorphism) tables and diagrams.
		Azuara impact structure (Spain), Ries impact structure (Germany): impact as a geologic process
		A few kilometers outside the northern ring of the Azuara impact structure near Belchite, a handful of isolated large blocks of Jurassic limestones emerge from the post-impact Upper Tertiary Ebro basin sediments.
	www.impact-structures.com (698 words)

	MARS METEORITE, MARTIAN METEORITES, SHERGOTTITES, & NAKHLITES FOR SALE
		Martian meteorites belong to an extremely rare group of meteorites known as the Shergottite, Nakhlite, and Chassigny (SNG) group.
		SNC meteorites are from the planet mars, and are actually pieces of the crustal mantle of the planet Mars that were blown into orbit by an enormous meteorite impact hitting the red planet hundreds of millions of year ago.
		Please let us know if you have a meteorite or high quality fossil that you want to sell and we will let you know whether we would be interested in purchasing them from you.
	www.arizonaskiesmeteorites.com /AZ_Skies_Links/Martian (212 words)

	APOD: 2005 July 24 - A Chicago Meteorite Fall (Site not responding. Last check: 2007-10-29)
		Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer.
		This occurred around midnight on March 26, 2003 in Park Forest, Illinois,
		meteorite, measuring about 10 cm across, was one of
	antwrp.gsfc.nasa.gov /apod/ap050724.html (153 words)

Try your search on: Qwika (all wikis)