Hit by a meteor

Meteorite collision on Earth and cause catastrophic extinction of the dinosaurs, 65 million years ago. However, previous dinosaur populations are already shrinking. ANIMAL mighty dinosaurs suddenly slumped in fear. After living down through generations for 130 million years earth change without warning ominously against them. Loud explosions were heard, the sky like a collapse. Then the chaotic weather. Oppressive heat, the dusty air, and the sky was pitch black. Body mighty dinosaurs not been much help. They lay dead, along with half the other living creatures that inhabit the earth. Hard shocks, according to the theory advanced by paleontologists University of Rhode Island, United States, arising because of a 10 km diameter meteorite hit the earth about 65 million years ago. Shocks and heat generated, according to estimates, is greater than the entire nuclear bomb explosion that exist today. The big bang prey on victims directly. However, bigger victims fell in the following days, due to changes in weather and dust particles that pollute the air. Habitat dinosaurs became ruins. Meteor dust that the newly appointed Haraldur Sigurdsson, University of Rhode Island oceanography experts, as the foundation of his theory. Meteor dust physically resembling shattered glass, but rich in the element iridium, the material commonly found in rocks of the meteor. Flakes "glass" was, according to research Sigurdsson, wedged in rocks that formed in the Cretaceous era, the era of dinosaurs otherwise destroyed. Conclusion The University of Rhode Island team was to strengthen the thesis based on the fact that dinosaur fossils no matter who is younger than 65 million years. However, according to the theory, these ancient animals disappeared because of natural disasters, drought, or possibly even flooding which hit almost the entire surface of the earth. It's just a theory "drought" and "flood" is not supported in-depth explanation. Only later Sigurdsson ensure that the natural disasters that shaped an abrupt climate change, because there was a meteor hit the earth. Dinosaurs supposedly began to appear in 195 million years ago, in the form starikausaurus, lizard-like animal about two meters in length with a weight of 30 kg. These animals are not reptiles. He walked with head erect, and resting on two front legs. Although his head like a lizard, the shape of her legs were like the feet of mammals. Some dinosaur experts believe that animals are descended from an ancient reptile called thecodont relatives. There's not much scientific data about thecodont. However, he was considered to have evolution, the process for 50 million years, then grew so starikausaurus. Then, at a later stage, starikausaurus continued evolution into various kinds of dinosaurs. Among the scientific community, the new dinosaur's name echoed 150 years. At first, the ancient animal fossils found in Mary Ann Mantell, wife of the British paleontologist Gideon Mantell. Because only a few pieces of gear and armed with a number of pieces of bone, that Mantell's wife's husband was unable to reconstruct these ancient forms of animals. Then, in 1841, the British anatomist Richard Owen and formed a framework reconstruct ancient creatures like reptiles. Owen called the dinosaur - a giant lizard. The amount estimated to equal rhino now. However, the belief that dinosaurs were identical with the ancient reptile, immediately shaken. In 1861, the Germans found intact dinosaur skeleton, identified as Archaeopteryx. His body was like a lizard, but strangely he had feathers like birds, and even have wings. So, he was considered "crossing" the family of birds and reptiles. No wonder dinosaurs identity is still debated. Understandably, these fossils are found exclusively in the form of skeletal bones. Organs, and the physiology (physiology) can not be clearly revealed. So, there is still place them close relatives of reptiles, but some are considered as the ancestors of birds, even some "menobatkannya" in the mammal family. Deinonychus fossil discoveries, a century after the discovery of Archaeopteryx, by the Yale University paleontologist John Ostrom, in the United States cited for "memburungkan" dinosaurs. As observed Ostrom, deinonychus did have great similarities with the birds. These ancient animals, Ostrom says, can stand upright, with the rest on two feet. Toes structure similar to the present bird foot - there are hoofed fingers, and have spurs, but the front legs are less developed. Deinonychus a length of almost 3 meters and weigh about 80 kg. However, merely from the form's anatomy can invite endless debate. Why not. Look at lagosuchus fossil, found in Argentina. These ancient animals only 30 cm in length. He, like deinonychus, also walked upright on two legs up on the back. However, other similar body structures lagosuchus now flying reptiles. So, he thought to represent features of the dinosaur reptiles. So, Robert Bakker, paleontologist from the University of Colorado, more concerned about the condition of dinosaur physiology: warm-blooded animals like birds and mammals nation or cold blooded like reptiles. Bakker pointed at the giant dinosaur brontosaurus. These ancient animals, Bakker said, is able to move quickly up to 5 km per hour. This estimate is based on the study of trace-trace. Capability moving dinosaurs, according to Bakker, higher than the average reptile today. "Lizards can move quickly, but only for short distances," he said. With this comparison, Bakker concluded that dinosaurs had a fast metabolism, so bloody hot. Although not resist the conclusion, Jack Horner, paleontologist University of Montana, United States, considers Bakker approach is less fitting. He observed the development of a new dinosaur came out from their eggs. Children hadrosaurus newly hatched, Horner said, only about 35 cm in length. However, one year and then grow 2.7 meters. Sepesat growth, both in absolute amounts and percentages, Horner said, had never shown any other reptiles, snakes are not not too crocodile. Horner also briefly examined, microscopically, the bones of dinosaurs, crocodiles today, and modern birds. In the bones of birds and dinosaurs, Horner found many channels of blood vessels, surrounded by a network of similar shaped wicker. In the bones of crocodiles, such vessels is very small. This suggests that birds and dinosaurs share the same metabolic activity faster than the crocodile. So, concluded: hot-blooded dinosaurs, not reptiles. Over 130 million in developing, exploring dinosaur almost every continent, and to adapt to various environmental conditions. There is a body towering over 40 meters, as supersaurus found in Colorado. These huge animals eating plants, and its weight can reach 30 tons. Setipe with this supersaurus called brakhiosaurus likes to live in the lakes. Body length 24 meters, and if you look up his head 12 feet from the ground. Then, there's more Mamenchisaurus, length of 20 meters. He was found in Mamenchi, Sichuan, China. Among these dinosaur relatives are partly beasts, like the other dinosaurs to prey. Among them is called brontosaurus, carnosaurus, or baryony. However, for Jack Horner, dinosaur extinction was not due to prey on one another. Not also because such collision meteor expert from the University proposed Rodhe Island. By Jack, before the era creataceous, 65 million years ago, the population also has shrunk drastically. Horner took a sample of dinosaurs that lived in the valley of Alberta, Alabama. Approximately 73 million years ago, there are 35 kinds of dinosaurs there. This figure is shrinking so 20-25 species in seven million years later. In the next three million years only six species. "So, there is a process pemunahan before the meteor crash," he said. And that for him is still mysterious.