Dinosaurs appeared in the 140 million years ago, and are prosperous in the end of the Mesozoic reptiles 65 million years ago. Or dinosaurs and fuzzy with the same era, plesiosaurs, pterosaurs and other general term. Dinosaurs suddenly disappeared in a given period, become a mystery in the history of the Earth’s biological evolution, the fans so far no such solution. Earth’s biological, are recorded in the fossil record. Mesozoic strata, many dinosaur fossils have been found. Which can be seen showing the bones of a wide range of shapes. Followed by Cenozoic strata, however, can not see less than a dinosaur fossil. Thus infer that with the extinction of the dinosaurs in the Mesozoic.
Dinosaur species differ in the shape and habits. Which sub can have dozens of elephants together then; small, but with a chicken. Diet is gentle vegetarians and violent carnivore, meat and vegetables eat omnivorous dinosaur, dinosaurs.
About the real cause of dinosaur extinction, there are a lot of lively debate clouds since the ancient times, but they do not have a certain argument, and thus far still study is an unsolved puzzle, in which only some of the better known argument described as follows :
Meteorite collision theory:
Dating back 65 million years ago, a huge meteorite hit the Earth, the monarchs of the earth up to one hundred million of thousands of years of dinosaur extinction. This theory is Louis from the University of California, Berkeley. Al Ballesteros, PhD, four scientists. This is a huge meteorite with a diameter of about 10 kilometers. Impact crater topography, up to 200 km in diameter. Due to the impact on energy, if converted into the yellow explosives, equivalent to one hundred trillion tons (megaton). The spread of dust through the atmosphere to the layered ring. The Earth lasted for a few months of the dark state. During this period, dinosaurs led by many biological consequent extinction.
Comet collision theory:
Comet collision is paleontologist – David? Laupp and John? Sepp Kesi Ji paleontological extinction occur once every 2,600 years “argument for the beginning produced. Louis? Alba Razvan this argument and theory gave astrophysics – Charlie? Absurd pull, then the absurd pull revenge due to the sun’s semi-star goddess star’s gravity, the comet to Earth periodically sake.
Occurred in the late Cretaceous orogeny makes the marsh dried up, many dinosaur swamp home is unable to regenerate to live. Changes in the gas after the plant has also changed, herbivorous dinosaur can not adapt to the new food, while the successively extinction. Extinction of herbivorous dinosaurs, carnivorous dinosaurs have lost according to hold, the results are extinct. This extinction process, which lasted between 1,000 and 2,000 years. To the end of the Cretaceous, and finally to extinction on Earth.
Climate change theory:
As a result of plate movements, currents have changed, but also cause huge climate of change. Cold climates the plants die, dinosaurs lack of food led to the demise.
Volcanic flame theory:
Eruption of carbon dioxide a lot of spray, resulting in anxious and excited Earth’s greenhouse effect, making the food of death. Volcanic flame makes the salt prime the unleashing of the breakdown of the ozone layer, harmful ultraviolet radiation of the Earth’s surface, resulting in biological extinction.
Ocean at low tide theory:
According to Buck, the ocean at low tide, the land borders, the biological one another in contact, resulting in a certain class of biological extinction. Such as kangaroos, kangaroos survive in Europe, this island continent, but on the declaration of the demise of other species of animals met in the South American continent.
Warm-blooded animals theory:
Some people think that dinosaurs were warm bloody animal, so it may not withstand the cold weather which led to the Late Cretaceous can not survive. Even if the dinosaurs were warm bloody, body temperature is still high, may be similar to the extant sloth’s body temperature to maintain body temperature, and can only survive in the tropical climate zone. The respiratory organs of the dinosaurs is not perfect, can not fully supply oxygen, they do not have thick hair to avoid hypothermia, but it is easy to lose a lot of heat from its long tail and long feet. Warm-blooded animals and cold-blooded animals is not the same place, is that if the temperature drops under a certain range, it is necessary to consume physical strength in order to improve the temperature, the body will quickly become weak. They are too large body drive, can not enter the cave of refuge from the cold, cold day last several days, may be because of exhaustion and the fate of being frozen to death.
Kill each other theory:
Some people think that the real reason dinosaurs extinct because the result – they kill each other carnivorous dinosaurs, herbivorous dinosaur food, carnivorous dinosaur increase, herbivorous dinosaurs naturally less and less and finally disappear, carnivorous dinosaur meat edible killing each other, and finally die.