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BLOG #5 - WHY DID THE DINOSAURS DISAPPEAR ?

Something drastic happened on Earth about 65 million years ago. According to one theory, an asteroid more than 6 miles across struck just off the coast of Mexico's Yucatan Peninsula. The impact created a chicxulub crater, more than 110 miles wide, and caused a gigantic dust cloud. The dust settled forming a layer of iridium - rich clay now found in sedimentary rock under the Atlantic and Pacific oceans and in most northern land masses. The cloud likely caused the world temperature to drop.
The Chicxulub Crater on Earth
                     Scientists link this global cooling to the extinction of dinosaurs and numerous other plants and animal species. The fossil record shows this disappearance in the significant differences between the remains from the cretaceous period of the mesozoic era and those from the tertiory period of the cenozoic era - a transition point called the K-T boundary. Other geological events caused atmospheric changes that may also have contributed to the mass extinction.
The Chicxulub Crater as visible from space
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