Discipline of Geology - Department of Physical Sciences - College of Science - University of the Philippines, Baguio

UP Baguio | College of Science | Department of Physical Sciences | Discipline of Geology

Recommended Readings

A cool early Earth? (Scientific American, 2005)

Posted by arleneteng on February 1, 2010 at 11:08 AM

by John. W. Valley


 

The textbook view that the earth spent its first half a billion years drenched in magma could be wrong. The surface may have cooled quickly—with oceans, nascent continents and the opportunity for life to form much earlier.


In its infancy, beginning about 4.5 billion years ago, the earth glowed like a faint star. Incandescent yellow-orange oceans of magma roiled the surface following repeated collisions with immense boulders, some the size of small planets, orbiting the newly formed sun. Averaging 75 times the speed of sound, each impactor scorched the surface—shattering, melting and even vaporizing on contact.


Article (PDF format, 525 Kb)


 

Categories: Nat Sci 3

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References

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