How did the Earth begin?

Answer

Scientists agree that the Earth formed about 4.6 billion years ago out of accreted matter from the solar nebula. All planets in the solar system formed the same way. Once the proto-Earth was formed, many changes occurred over vast timescales to produce the Earth of the 21st century.

The formation of Earth's atmosphere is attributed to early volcanic activity. The early Earth remained molten due to continued volcanic activity as well as frequent collisions with other celestial bodies. One of the biggest of these collisions is thought to have tilted the Earth on its axis while simultaneously creating the moon. Once the Earth cooled and formed a solid crust, liquid water was able to cover parts of this surface.

The earliest life appeared between 3.8 and 3.5 billion years ago, by way of a process that remains unknown. Life on Earth remained microscopic until approximately 580 million years ago, when the first multicellular life forms developed. Earth's life forms and geology are constantly changing, as new species evolve and others go extinct, and plate tectonics keep the structure of the Earth in a constant state of flux.

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Q&A Related to "How did the Earth begin?"
Common scientific theory is that 4.6 billion years ago Earth was nothing more than a molten ball of lava. It gained substance and size by the constant collisions of other smaller
http://www.ask.com/web-answers/Science/Astronomy/h...
NOBODY KNOWS WHAT conditions are needed for life to begin. Some scientists have suggested that living cells may have been brought to Earth by a comet. When Giotto probe investigated
http://wiki.answers.com/Q/According+to+scientists+...
There are several theories either god put it here or the Big Bang theory. Thanks for using
http://www.chacha.com/question/how-did-the-earth-b...
Dear Saurav, You have 11 question marks (questions) in your message. I will try to answer your questions one by one. "how did the earth started? The story of the present universe
http://en.allexperts.com/q/Hindus-946/2009/8/earth...
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