Meteorite Main

Scientists Want To Find Out Why Severe Extinction Happened Repeatedly?

Billions of years ago, there are more than billions of species on the earth, but now the number of existing species is just about millions. In other word, 99% species which once appeared on the earth were extinction. Extinction exists with the history of the mankind, no species can live forever and existing species would die away one day. According to scientific research, the main reasons of extinction are competition among different species, changes in the environment and other evolutionary factors.

Scientists used to think that Severe Extinction, species extinguished in a short period of time, just happened twice. But a recent research show that there are about 23 times of the Severe Extinction. It also shows a periodicity with occurring about every 2600 years. Scientists want to find out why Severe Extinction happened repeatedly?

Take the extinction of dinosaur for example, the reasons of dinosaur extinction given by scientists are climate change, volcanic eruptions and even other absurd suspicions. In 1980, the theory about dinosaur extinction, proposed by Louis Alpha Raz, was approbated by most people. Louis Alpha Raz, winner of the Nobel Prize in Physics in 1968, said the reason of dinosaur extinction was a hit between an unknown asteroid and the earth. Huge energy was released from this hit, with the equivalent energy of hundreds of thousands of atomic bombs, which led to the extinction. It sounds inconceivable, but Louis Alpha Raz gave proofs to support his theory. Rare elements of high concentration were found at terrane which formed at the time of Cretaceous and Miocene. As is known to all, rare elements are usually found in Meteorites, so this is a proof that a Meteorite may hit the earth in late Cretaceous period. Coincidentally, a crater, 180 km in diameter, was found in 1990 at the Yucatan peninsula in Mexico, which was, considered by scientists, formed because of this hit.

To explore the reasons of species extinction is undoubtedly a difficult work. When we try our best to find out the answers, we may be confused. Thinking from a different angle, we may discover the global ecosystem is in critical condition, the same to earth crust, forest and sand. Species extinction is the result of ordinary process of evolution and it is very natural.

About the Author

Copyright by Manu Wallace. We promise to offer Links of London with most reasonable prices and excellent quality. At the same time, our best service will be available for you at any time. Do not hesitate any more, place an order quickly. I am sure you will enjoy your shopping at here.

desribe the main classifications of meteorites?

how do astronomers believe these diffrent types of meteorites originated?

remaining debri of destroyed planets:
rock based - planetary crust and mantles
and metal based - planetary centra




Classified Jiddat al Harasis 813 Meteorite JaH 813 MAIN MASS 279 Lbs1266g
Classified Jiddat al Harasis 813 Meteorite JaH 813 MAIN MASS 279 Lbs1266g

$445.00
28d 14h 26m remaining

MeteoriteNWA 8133L3528661 Grams NEW Main Mass
MeteoriteNWA 8133L3528661 Grams NEW Main Mass

$1,599.99
19d 35m remaining

Classified NWA 6947 Meteorite MAIN MASS 25552 POUNDS 11590 GMS
Classified NWA 6947 Meteorite MAIN MASS 25552 POUNDS 11590 GMS

$1,475.00
3d 16h 32m remaining

Classified NWA 6947 Meteorite 3rd LARGEST MAIN MASS 19039 POUNDS 8636 gms
Classified NWA 6947 Meteorite 3rd LARGEST MAIN MASS 19039 POUNDS 8636 gms

$1,079.00
12d 15h 25m remaining

Martian Shergottite NWA 12335 Meteorite 229 kg main mass from the planet Mars
Martian Shergottite NWA 12335 Meteorite 229 kg main mass from the planet Mars

$270,000.00
20d 17h 4m remaining

NWA 6952 L4 Chondrite Meteorite 1771 gram main mass
NWA 6952 L4 Chondrite Meteorite 1771 gram main mass

$295.00
20d 3h 49m remaining

Meteorite fall from Madagascar 11241 gram Main Mass Benenitra Museum Piece
Meteorite fall from Madagascar 11241 gram Main Mass Benenitra Museum Piece

$80,000.00
21d 3h 31m remaining

Classified NWA 6947 Meteorite 2nd LARGEST MAIN MASS 21043 POUNDS 9545 GMS
Classified NWA 6947 Meteorite 2nd LARGEST MAIN MASS 21043 POUNDS 9545 GMS

$1,175.00
12d 15h 26m remaining

NWA 12468 meteorite 2178 grams main mass eucrite
NWA 12468 meteorite 2178 grams main mass eucrite

$199.95
9d 17h 36m remaining

NWA 2046 Rare Martian Meteorite MAIN MASS
NWA 2046 Rare Martian Meteorite MAIN MASS

$34,000.00
17d 20h 53m remaining

NWA 10836 LL3 Primitive Chondrite Meteorite 295 gram main mass
NWA 10836 LL3 Primitive Chondrite Meteorite 295 gram main mass

$737.00
12d 23h 35m remaining

MAIN MASS RARE SHOCKED WITH VESICULES NWA 11288 MARTIAN METEORITE 591 GMS
MAIN MASS RARE SHOCKED WITH VESICULES NWA 11288 MARTIAN METEORITE 591 GMS

$10,875.00
1d 2h 49m remaining



« Previous12345


Tagged with:

Filed under: Meteorites & Tektites