Answers

2015-08-02T20:07:58+05:30
The earths upper layer id broken into many pieces or plates known as tectonic plates..pls rate this as the brainliest answer.plsss
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2015-08-02T21:07:19+05:30
Plate tectonics is a scientific theory that describes the large-scale motion of Earth's lithosphere. This theoretical model builds on the concept of continental drift which was developed during the first few decades of the 20th century. 
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