added 2007 Thu Mar 22 20:21:21 by capn_caveman
The oldest known chunk of Earth's crust has been found in Greenland, and dates back at least 3.8 billion years. The substantial rock is an important find, because it is a type known as ophiolite and provides the best evidence yet that continental drift had been going on for at least a billion years longer than thought.
The oldest known chunk of Earth's crust has been found in Greenland, and dates back at least 3.8 billion years. The substantial rock is an important find, because it is a type known as ophiolite and provides the best evidence yet that continental drift had been going on for at least a billion years longer than thought.
