Answers

2016-05-03T10:50:23+05:30
2016-05-03T11:21:11+05:30
Alfred Wagner in 1920.According to the generally accepted plate tectonic theory, Earth's surface is broken into a number of shifting slabs .These slabs move relatively above a more mobile zone at rates as great as a few inches every year.Most of the world's active volcanoes are located near the boundaries of  shifting plates , called plate-boundary volcanoes.
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