The Cretaceous-Tertiary Impact Theory

Introduction The Cretaceous- Tertiary experimental extinction yield was one of the largest mass extinctions constantly recorded on Earth. Occurring 65 million years ago, this destructive event marked the extinction of thousands of animal species including dinosaurs, mosasaurs, plesiosaurs, and pterosaurs. Dramatic extinctions as wellspring occurred among microscopic floating organisms; some(prenominal) calcareous plankton and calcareous nanoplankton were besotted exterminated with only a few species surviving (Alvarez et al. 1980). Alternatively, just about crowds were little affected, including the terrestrial plants, crocodiles, snakes, mammals, and umteen kinds of invertebrates. It is estimated that a little over half of all funding species present at the sense of equilibrium of the Cretaceous did not pull done the mass extinction (Russell 1979). A dark grey dust sediment layer 3-8 centimeters divinatory divides the end of the Cretaceous breaker point and the blood line of the Tertiary, this layer is referred to as the K-T boundary and is found just about globally (K is the traditional abridgment for the Cretaceous Period, and T is the abbreviation for the Tertiary Period). For years the scientific community debated the cause the extinction; many hypotheses, such as massive volcanic eruptions, profligate solar radiation and others, were presented even so they lacked the proper backup evidence.

Finally, beginning in the 1980s through until the early 1990s several(prenominal) prominent researchers including Luis Alvarez, Bruce Bohor, and Alan Hildebrand began to present evidentiary proof that an asteroid squeeze caused the Cretaceous-Tertiary (K-T) mass extinction. In this paper we will discuss the Cretaceous-Tertiary feign theory and look at the important pieces of evidence supporting it, including the high levels of iridium and opposite out of the water quartz in the K-T layers, as well as the Chicxulub crater in southern Mexico. atomic number 77 concentrations Iridium is an element of the platinum group of metals; it is very hard, very heavy(a) and is one of the rarest...If you essential to read a full essay, coordinate it on our website: Ordercustompaper.com

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