Ages of the Earth, How did the Dinosaurs Disappear?

Updated: Aug 7, 2020

How old is Earth, How did the Dinosaurs disappear? Informative blog

The article below gives a piece of brief information about the age of the Earth.

Ages of the Earth

Earth has formed some 4.6 billion years ago.

The time that has elapsed since the seems unfathomable to us. We consider ancient the happenings in early civilisations. But they are only a few thousand years old.

Our planets geographic time recedes to the dawn of time, far outstretching any time frame representing human habitation on earth.

Geologist separate earth’s history into major units of time called aeons.

Generally, four are recognised; the Hadean, Archaean, the Proterozoic and the Phanerozoic aeons.

The earliest two often called Precambrian time, cover the history of the earth before the first complex life forms appeared from 4.6 billion to about 5-42 million years ago.

Sometimes the Hadean period is incorporated at the beginning of the Precambrian; it spans the early formation of the earth and predates most of the geological record.

The Precambrian represents four-fifth of earth’s history. Little is known of it compared with the most recent aeons, the Phanerozoic which is known by its abundant fossil record.

Scientists separate the Phanerozoic aeon into three subdivisions, or eras: the palaeozoic (“old life “), the Mesozoic (“middle life”), and the Cenozoic (“recent life”).

The eras are separated according to the kinds of life forms that existed at the stage. Animal life sprang into its diverse form during the palaeozoic. Dinosaurs ruled during the Mesozoic when flowering plants also evolved.

Humans appear in the late Cenozoic, an era also known as the age of mammals.

The video above explains more about the topic.

Why Dinosaurs disappear?

The content below explains what happened 65 million years before which wiped out the whole species of dinosaurs

Something drastic happened on earth about 6.5 million years ago.according to the theory, an asteroid more than 6 miles across struck just off the coast of Mexicos Yucatan peninsula. The impact created the chicxulub crater, more than 110 miles wide and caused a gigantic dust cloud.

The dust settled forming the layer of iridium rich clay now found in a sedimentary rock under the Atlantic and Pacific Ocean and in the most northern landmasses.

The cloud likely caused world temperature to drop.

Scientists link the global cooling to the extinction of dinosaurs and numerous other plant and animal species. The fossil record shows this disappearance in the significant differences between the remains from the Cretaceous(k) period of the Mesozoic era and those from the tertiary(T) period of the Cenozoic era transition point called the K-T boundary.

Other geological events caused atmospheric changes that may also have contributed to the mass extinctions.

The video above explains more about the topic.

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