Ages and earth?

Question

How is the world??

Answer 1

http://www.ucmp.berkeley.edu/exhibits/ge...

Answer 2

The Earth is about 4.5 billion years old.

Answer 3

Best estimates are that the earth's crust solidified 4.5 billion years ago.  This is taken as the birth of the earth, and is based on estimates of the age of the oldest rocks.  But the earth actually existed before that as a blob of molten rock growing by accreting particles  from the huge disc of rocks and gases that was floating around the sun, forming the solar system.  This process took several hundred million years.