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 Alfred Wegener in 1912
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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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plz mark as brainliest
still iam not getting my answers
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