History Of The Earth

history of the earth During the past billion eld, the Earth’s climate has changed from potent, ice-free decimal points to cold periods where the Earth was covered with umpteen huge glaciers, and back to warm again. We are currently conterminous the end a warm period in surrounded by ice ages. It is believed that there were many ice ages, 36, 15, and 3 billion years ago. The last ice age is estimated to have been virtually 20,000 years ago. Approximately 55 million years ago the whole earth was warm. The difference in temperature of the equator and the arctic was oftentimes less than it is now.

Tropical conditions existed into the Central United States. It was so warm that trees grew at both poles, and alligators lived in Ellesmere Island, 78 degrees North. This warm period was called the Eocene. The Eocene was followed by cooling. Between 52 and 36 million years ago icecaps began to develop in Antarctica and the temperature around the ice caps began to drop. close 28 million years ago sh...If you want to abide a full essay, order it on our website: Orderessay

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