Why does the presence of iridium support the idea that a meteorite struck Earth…?
Why does the presence of iridium support the idea that a meteorite struck Earth, possibly bringing about a mass extinction at the end of the Mesozoic Era?
A. Records of the period show a cloudy atmosphere for months at a time.
B. Iridium is rare on Earth but common in meteorites.
C. Rocks show a 100 percent increase in iridium at that time.
D. There was an increase in species.
B.
Ir is enriched in meteorites relative to Earths CRUST.
However, IR is also enriched in Earth’s CORE relative to Earth’s crust. So mantle plume volcanism originating from the core-mantle boundary also explains the IR enrichment at the K-T boundary.
End of the world Meteor Collision
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NWA 5950 CV3 carbonaceous meteorite: 12.0 gram end cut $54.00 |
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JaH 640 meteorite: 75.6 gram end cut $8.50 |
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Sahara 02500 meteorite 33.7 gram polished end cut $7.39 |
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NWA 4482 pallasite meteorite 5.0 gram end cut $12.62 |
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NWA 869 meteorite: 13.2 gram polished end cut $1.25 |
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EXCEPTIONAL Meteorite Morasko – End Cut 2045g [ IAB- MG ] $2,290.00 |
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Campo Iron Meteorite 286g Etched End Cut – Excellent Value ! $59.00 |
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217g Ash Creek Texas L6 Chondrite End Fell April 16 2009 Meteorite Men’s Steve $7,595.00 |
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Meteorite SL-1311 – 1.34g + Fresh Fusion Crust + End Cut + Awesome Matrix + $2.95 |
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Meteorite SL-1312 – 1.78g + Fusion Crust + End Cut + Rounded Cone + Matrix + $2.95 |
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Meteorite SL-1313 – 1.44g + End Cut + Great Iron Display + Awesome Matrix + $2.95 |
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Meteorite SL-1314 – 1.34g + End Cut + Great Iron Display + Awesome Matrix + $2.95 |
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Meteorite SL-1315 – 1.68g + End Cut + Great Iron Display + Awesome Matrix + $2.95 |
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Meteorite SL-1316 – 4.17g + End Cut + THE MUSHROOM CLOUD + HAND CUT FOR DETAILS $4.95 |
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Meteorite SL-1317 – 0.95g + End Cut + Great Iron Display + Awesome Matrix + $0.99 |
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Meteorite SL-1318 – 1.54g + End Cut + Great Iron Display + Awesome Matrix + $2.95 |
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Meteorite SL-1319 – 2.54g + End Cut + Fabulous Crust with Details + Must Have + $2.95 |
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Meteorite SL-1320 – 6.38g + End Cut + Great Iron + Chondrules + Crust + Shape + $5.20 |
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End Cut IRON Meteorite Morasko – 870g [ IAB- MG ] $1,290.00 |
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NWA 869 meteorite: 12.0 gram polished end cut $1.04 |
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NWA 4482 pallasite meteorite 6.5 gram end cut $26.00 |
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Mendota meteorwrong – 29.8 gram end cut – Not a meteorite $2.00 |
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NWA 6392 Brecciated Diogenite meteorite 2.3 gram end cut $0.99 |
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NWA 869 meteorite: 14.7 gram polished end cut $2.11 |
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NWA 4528 meteorite: 11.3 gram end cut $1.25 |
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Meteorite NWA 5239, CV3, 7.3 g, stunning end cut! $8.49 |
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Meteorite NWA 5418, L6, 16.8 g, stunning end cut! $2.49 |
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Meteorite: NWA 787 (L6) – Found 2001 – 43.4 Gram End Cut $55.00 |
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Campo del Cielo iron meteorite 196 gram end etched treated with rust inhibitor $50.00 |
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Campo del Cielo iron meteorite 77 gram end etched treated with rust inhibitor $33.50 |
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Campo del Cielo iron meteorite 231g slice etched end treated with rust inhibitor $60.00 |
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*** Meteorite Bassikounou (H5) – 3.96g – end cut*** $0.95 |
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NWA 869 meteorite: 10.2 gram polished end cut $0.99 |
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NWA 5950 CV3 carbonaceous meteorite: 12.9 gram end cut $3.25 |
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JaH 055 meteorite: 24.6 gram end cut $0.99 |
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NWA 6283 H3.6 Meteorite 3.78g End Cut $180.00 |
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*** ANGRITE NWA 2999 Meteorite 2.57 gram end-cut! $310.00 |
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NWA 753 Rumuruti chondrite (R3.9) Meteorite – End Cut – 1,59g $40.00 |
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LOW PRICE! URUACU IRON METEORITE BRAZIL END CUT 736 GMS $384.30 |
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NWA XXX un classified meteorite 122.8 grams end cut $133.00 |
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NWA XXX un classified meteorite 77.7 grams end cut $82.00 |
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NWA XXX un classified meteorite 267.3 grams end cut $282.00 |
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NWA XXX un classified meteorite 166.6 grams end cut $179.00 |
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NWA XXX un classified meteorite 24.9 grams end cut $28.00 |
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NWA XXX un classified meteorite 119 grams end cut $131.00 |
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NWA XXX un classified meteorite 50.4 grams end cut $53.00 |
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NWA XXX un classified meteorite 23.2 grams end cut $26.00 |
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Campo meteorite etched end cut 976 grams Great etch! Nice inclusion $603.00 |
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NWA XXX un classified meteorite 99.5 grams end cut $112.00 |
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Canyon Diablo Meteorite etched end cut 1469 grams! $999.00 |
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Meteorite – Canyon Diablo 43g Polished & Etched End Piece $82.95 |
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MILES IRON METEORITE – END CUT – MIRROR POLISHED ON 2 SIDES $999.95 |
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GEBEL KAMIL IRON METEORITE – END CUT – MIRROR POLISHED $339.95 |
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BEAUTIFUL 240 GM. SILICATED AND ETCHED CAMPO DEL CIELO METEORITE END CUT!! $239.20 |
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Lunar meteorite NWA 6721 beautiful 3.239 grams end cut $3,200.00 |
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Lunar meteorite NWA 6721 Beautiful .278 grams end cut $270.00 |
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Lunar meteorite NWA 6721 Beautiful .331 grams end cut $330.00 |
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Lunar meteorite NWA 6721 Beautiful .769 grams end cut $760.00 |
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Lunar meteorite NWA 6721 Beautiful .391 grams end cut $390.00 |
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Lunar meteorite NWA 6721 Beautiful 2.789 grams end cut $2,700.00 |
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Lunar meteorite NWA 6721 Beautiful .285 grams end cut $285.00 |
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Lunar meteorite NWA 6721 Beautiful 1.196 grams end cut $1,190.00 |
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Lunar meteorite NWA 6721 Beautiful .845 grams end cut $845.00 |
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Nantan meteorite 36.9 gram etched end cut $44.00 |
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LOW PRICE! URUACU IRON METEORITE BRAZIL END CUT 109 GMS $104.25 |
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26.8g Deep Groove on End-Bar Tektite(Meteorite)#mg29 $5.36 |
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NEW – NWA 6658 mesosiderite meteorite 2.68g END CUTvery interesting type $33.00 |
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NEW – NWA 6658 mesosiderite meteorite 3.14g END CUTvery interesting type $37.00 |
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NEW – NWA 6658 mesosiderite meteorite 3.15g END CUTvery interesting type $37.00 |
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LOW PRICE! URUACU IRON METEORITE BRAZIL END CUT 514 GMS $314.30 |
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NWA XXX un classified sliced end cut meteorite 13.3 grams Nice interior $15.00 |
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Taza Meteorite etched end cut 16.3 grams! NWA 859 $118.00 |
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Taza Meteorite etched end cut 38 grams! NWA 859 $269.00 |
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GIBEON IRON METEORITE: PERFECT ETCHED, END PIECE WITH ORIGINAL CRUST; 871 gram $849.95 |
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LOW PRICE! URUACU IRON METEORITE BRAZIL END CUT 372 GMS $224.25 |
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Canyon Diablo Meteorite etched end cut 200 grams! $227.00 |
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NWA 869 meteorite end cut 41.5 grams! $45.00 |
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NWA XXX un classified etched iron meteorite end cut meteorite 95.4 grams $700.00 |
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NWA XXX un classified etched iron meteorite end cut 36.8 grams WOW! $371.00 |
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Silicated Campo meteorite 73.4 grams end piece Wow ! $187.00 |
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LOW PRICE! VERY NICE! URUACU IRON METEORITE BRAZIL END CUT 337 GMS $186.75 |
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LOW PRICE! URUACU IRON METEORITE BRAZIL END CUT 407 GMS $209.25 |
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LOW PRICE! URUACU IRON METEORITE BRAZIL END CUT 364 GMS $186.75 |
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LOW PRICE! URUACU IRON METEORITE BRAZIL END CUT 508 GMS $261.75 |
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LOW PRICE! URUACU IRON METEORITE BRAZIL END CUT 604 GMS $314.25 |
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LOW PRICE! GORGEOUS URUACU IRON METEORITE BRAZIL END CUT 650 GMS $336.75 |
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LOW PRICE! GORGEOUS URUACU IRON METEORITE BRAZIL END CUT 522 GMS $269.25 |
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LOW PRICE! HUGE GORGEOUS URUACU IRON METEORITE BRAZIL END CUT 735 GMS $351.75 |
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NEW – NWA 6870 CV3 Carbonaceous chondrite meteorite 30.0 gram END CUT – AWESOME! $139.50 |
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VERY NICE! AMAZING AL MAHBAS OR NWA 2683 PALLASITE METEORITE END CUT 35.8 GMS $87.20 |
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AMAZING 540G MUONIONALUSTA ETCHED METEORITE END CUT $495.96 |
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Canyon Diablo Meteorite etched end piece 46.5 grams! $50.00 |
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Brenham meteorite etched end cut 29.6 grams! Siderite $62.00 |
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Sacramento wash 002 Meteorite end cut 235.9 Grams! Main mass $1,200.00 |
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Canyon Diablo graphite Meteorite end cut 141.1 grams! WOW $365.00 |
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Nantan meteorite 59.7 gram etched end cut Very nice! $69.00 |
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NWA 869 meteorite end cut 103.9 grams! $82.00 |
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Seymchan Meteorite end cut 1373 grams! Cool shape! wow $1,600.00 |
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Silicated Campo meteorite 54.5 grams end piece Wow ! $102.00 |
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CANYON DIABLO meteorite Graphite Nodule end-cut 82.5 G. $330.00 |