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




NWA 10490 LL6 Meteorite Main Mass 696 grams fresh fusion crusted specimen Wow
NWA 10490 LL6 Meteorite Main Mass 696 grams fresh fusion crusted specimen Wow

$4,800.00
1d 2h 42m remaining

NWA 10701 H3 Chondrite Meteorite Main Mass 1684 grams
NWA 10701 H3 Chondrite Meteorite Main Mass 1684 grams

$2,950.00
7d 26m remaining

Moon and Mars Meteorite Main Masses
Moon and Mars Meteorite Main Masses

$120,000.00
8d 18h 19m remaining

NWA 2046 Rare Martian Meteorite MAIN MASS by catchafallingstarcom
NWA 2046 Rare Martian Meteorite MAIN MASS by catchafallingstarcom

$40,000.00
8d 18h 21m remaining

NWA 8678 Ureilite Meteorite 167 gram main mass
NWA 8678 Ureilite Meteorite 167 gram main mass

$4,300.00
15d 14h 38m remaining

Lunar meteorite 242 gram main mass of NWA 6570 feldspathic breccia RARE
Lunar meteorite 242 gram main mass of NWA 6570 feldspathic breccia RARE

$225,000.00
21d 7h 32m remaining

DOrbigny angrite meteorite 918 gram main mass
DOrbigny angrite meteorite 918 gram main mass

$950,000.00
21d 7h 32m remaining

NWA 8670 CK6 Meteorite 118 gram main mass
NWA 8670 CK6 Meteorite 118 gram main mass

$944.00
1d 15h 22m remaining

NWA 8675 Eucrite Meteorite 29 gram Main Mass
NWA 8675 Eucrite Meteorite 29 gram Main Mass

$925.00
1d 23h 23m remaining

NWA 10274 L5 Meteorite 832 gram main mass with highly shocked crushed zones
NWA 10274 L5 Meteorite 832 gram main mass with highly shocked crushed zones

$725.00
24d 2h 38m remaining

NWA 10700 LL4 6 Chondrite Meteorite 628 gram Main Mass
NWA 10700 LL4 6 Chondrite Meteorite 628 gram Main Mass

$4,325.00
7d 25m remaining

NWA 11194 CO3 Ornans Type Carbonaceous Chondrite Meteorite 119 gram Main Mass
NWA 11194 CO3 Ornans Type Carbonaceous Chondrite Meteorite 119 gram Main Mass

$3,500.00
25d 4h 33m remaining



« Previous1234


Tagged with:

Filed under: Meteorites & Tektites