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A heated debate among paleontologists is over what caused the extinction of the dinosaurs. Today, most people acknowledge that something catastrophic had to happen about 65 million years ago to eliminate the species.

You are a consultant at a museum. You are speaking to visitors. The visitors are standing before the final display in your dinosaur exhibit. It's the one that shows the great creatures' downfall.

One theory says that mass extinctions are actually common. That theory is outlined below. Using it, write a speech that describes the moment the extinction began.

Extinction Processes

  • Extinction happens in both the land and the sea.
  • Plants tend to be highly resistant to mass extinctions.
  • Some tropical forms of life disappear during mass extinctions.
  • Certain groups of animals tend to experience them repeatedly (for example, trilobites).
  • There seems to be equal spacing between extinctions (they occur about every 26 million years).

These guidelines help paleontologists figure out what caused the disappearances of certain species. These causes are called agents. They are divided into two types:

  1. Catastrophic agents -- meteors and comet showers
  2. Earth agents - volcanoes erupting, polar ice caps melting, global climate changing

(Used by permission of the Carleton University Museum)

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