It may only have taken one of these changes to affect life on Earth, or perhaps it was a combination of several. Based on different research we outline some theories about why they became extinct. Organisms that are unable to do this quickly enough can become extinct. Scientists still debate what killed off all the dinosaurs 66 million years ago. You have to like puzzles. ... Everything Dinosaur. About 65 million years ago, at the end of the Cretaceous Period, the Earth was affected by major changes to its environment. Human actions and changes in the environment (KS3 Sc 3.4c) Data, theories, explanations (KS4 HSW 1.1) Carbon cycle and the balance of gases in the atmosphere (SCN 4-05b) The environment and human influences (KS3 EXTINCTION THEORIES FOR J. David Archibaldn and Norman MacLeodw nSan Diego State University and wNatural History Museum I. Scientists believe that the event leading to the extinction may have been a massive asteroid impact or huge volcanic activity. One of our favorite dinosaur extinction theories involves another star, called Nemesis. Multiple Causes III. It may only have taken one of these changes to affect life on Earth, or perhaps it was a combination of several. Their extinction. Further confirming their theory regarding extinction, the researchers in this study found evidence in the sea floor, melted fragments of rock, that pointed to an asteroid strike, CNN reports. watch: screenshot: download: Supported by. Through fieldwork and studying dinosaur fossils here and in collections around the world, Museum palaeontologists are shedding light on dinosaur diets and behaviour. Dinosaur discoveries. Around 201.3 million years ago, a worldwide extinction event took place. This change is evolution. Learn about the climate, vegetation and living things of the late Cretaceous period. A fun science lesson for kids explaining the theories on what caused the extinction of the dinosaurs including a giant asteroid, volcanoes, and an ice age! Sudden Change. Charles Darwin was an English naturalist. The Bengal tiger is endangered, meaning there are not a lot of them and the species is at serious risk for extinction. But alot of dust and particles blocked a maximum amount of the sun. Scientists believe that a large asteroid hitting Mexico caused the extinction of the dinosaurs. Many theories have been advanced to explain the extinction of non-flying dinosaurs: poisoning by flowers, the destruction of their eggs by the first mammals, the harmful radiation of a distant supernova, epidemics. Check out these fun asteroid facts for kids. $3.99. Many theories have been put forward to explain how evolution happens. Share them with your kids and see which they think really happened. According to scientists who maintain that dinosaur extinction came quickly, the impact must have spelled the cataclysmic end. Theories of Dinosaur Extinction Aberdour School KS3 Group, Runner-up. A popular idea among scientists is that a large asteroid impact created a huge amount of dust that blocked out the sun and made it difficult or impossible for plants to grow, killing off the dinosaur food chain. Animal and plant life were plunged into danger. Our tips from experts and exam survivors will help you through. He explained his ideas about evolution in a book, Individuals in a species show a wide range of, Inherited variation is due to differences in their. Read about our approach to external linking. There are dozens of theories to explain a probable cause or causes. Humans disturbed the dodo's … He explained his ideas about evolution in a book On the Origin of Species, published in 1859. 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