Earliest evidence of plate tectonics.

Science News | March 11, 1989| | Copyright

Earliest evidence for plate tectonics

Earth scientists are still trying to piece together the plate-tectonics puzzle. What exactly pushes the vast fragments of the Earth's outer shell around the surface, and when did the crustal plates first break up and start sliding around, warping, tearing and burying each other as they collide?

The Earth's surface provides solid evidence that the crustal plates have been moving for 600 million years. Less direct evidence supports plate tectonics back to 1.9 billion years ago. Now, four researchers say they have found ...

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