What Killed the Dinosaurs? Off all the many questions related to dinosaurs their disappearance from the earth is the most mysterious of all. Their traces are even found on a few isolated oceanic islands such as Spitsbergen and North Island, New Zealand. Some dinosaur extinction theories postulate that dinosaurs died from the cold while others suggest that beasts died from the heat or else it was too hot in the summer and too cold in the winter. One theory hypothesis is that the climate became too wet while another that the climate dried out to kill off the dinosaurs.
Mass Extinction Part A: Mass extinction can typically be thought of as the extinction of an entire species/ rapid disappearance of a species due to environmental or human causes. Traditionally mass extinctions have been seen ass some type of catastrophe for the worlds biota. Definition however must include: • Event must be rapid • Over 50% of all life on earth became extinct • Life forms that become extinct must belonged to a different phyla, on land and in the sea. There have to date been five mass extinctions, the oldest occurred during the lower Cambrian Period some 542-488 [pic]million years ago. The Cambrian Period is the first period of the paleozia period.
Wegener's theory also provided an alternate explanation for the formation of mountains (orogenesis). The theory being discussed during his time was the "Contraction theory" which suggested that the planet was once a molten ball and in the process of cooling the surface cracked and folded up on itself. The big problem with this idea was that all mountain ranges should be approximately the same age, and this was known not to be true. Wegener's explanation was that as the continents moved, the leading edge of the continent would encounter resistance and thus compress and fold upwards forming mountains near the leading edges of the drifting continents. The Sierra Nevada Mountains on the Pacific coast of North America and the Andes on the coast of South America were cited.
Daniel T*** Candidate Number- 71** Centre Number- 443** What Killed The Dinosaurs? Contents Page Front Cover ………………………………………………………………… 1 Table of Contents ………………………………………………………… 2 Introduction ……………………………………………………………….. 3 Scientific Background ………………………………………………….. 4 Argument for What Killed the Dinosaurs ……………………….. 8 Arguments Against this theory ……………………………………… 10 Introduction So then, the big question is what killed the dinosaurs? For around 200 million years dinosaurs had ruled the world, they had grown huge in every environment. Then around 65 million years ago, they suddenly disappeared from the fossil record. What lead to their extinction will be discussed in this case study.
This review aims to set out the text within the wider literature by exploring the wider debate and key theme, outlining the structure and general text. The focus will then shift to the critique of the book providing both positive and negative reviews. The Author Jan Zalasiewicz is a lecturer in Geology at the University of Leicester, he is a field geologist who specialises in palaeontology and stratigraphy. He has published over a hundred papers in scientific journals, some of his later work focuses on the theory that we have entered a new epoch called The Anthropocene. He has an interesting view on Geology as he states how he would like to pursue a less conventional interest between
Nesting Season 5. Reasons for Haunting 6. Other Threats to these Species 7. Conservation Efforts 8. Conclusion Introduction Everyday thousands of marine animals were being cruelly killed in many parts of the world.
This is one of the oldest methods of knowing when ground deformation was caused because of rising lava. We also use electronic tilt meters, this is very similar to what a carpenter uses, it has a small container filled with a liquid and a bubble (to measure the change of the slope) There are different and varied sensitivity of tilt meters, for example; you can use tilt meters with ranges from 10 to 10,000 microradians depending on the volcano and range of tilt. “A bulge on the north flank, this was caused due to a blockage at the opening at the top of the volcano. The magma formed in a chamber on the side of the volcano and it was being pushed outward because the more magma was getting forced to the side. It increased by 7 ft a day.” Earthquakes You can predict when a volcano will erupt because you get earthquakes.
The name dinosaur translates as 'terrible or wondrous lizards' and they certainly evolved in a huge range of sizes and shapes, from the gigantic plant-eating sauropods to the quick meat-eating tyrannosaurs. So far, the remains of over 1,000 different dinosaur species have been identified from fossils the extinction of most dinosaurs species occurred in the Cretaceous-Tertiary Extinction event. Fossil records show that birds evolved within the Theropod dinosaurs during the Jurassic period. Some birds survived the Cretaceous-Tertiary Extinction event from which modern birds
Mystery of Mayan Civilization Fawn Barrette Professor Ewing Humanities 111 25 April 2012 Abstract What happened to the Maya civilization? It seems that around 800AD the Maya population had reached an all time high, but in 900AD the population crashed. (Scott, 2004) The people seemed to have simply disappeared and many theories evolved to try to explain this. Some of the theories are: earthquakes, climatic changes, epidemic diseases, social decay and deforestation and drought, but of course the Mayan people did not totally disappear and there are some Mayan descendants still living around the area and most of these theories have been disputed. The first theory is that widespread disease could have caused some rapid depopulation through the spread of infection itself and indirectly as an inhibition to recover over the long run.
There are more than 10,000 different species of animals living in the Great Barrier Reef and some even never named by scientists. The formation of the Reef The sea floor on which the Great Barrier Reef now sits was formed about 500,000 years ago, however the Great Barrier Reef today is very different in size and shape as coral has continued to live on top of many layers of dead coral from centuries ago. The existing structure of the reef is about 6,000 to 8,000 years old. The current Great Barrier Reef began to form during the last Ice Age which occurred about 26,500 to 20,000 years ago according to scientific research, caused significant environmental changes in the area, including drastic drops in sea levels. Life in the Great Barrier Reef Some of the most unique and beautiful creatures in the world can be found in the Great Barrier Reef.