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task 4 A caldera is created after a volcano erupts. The eruption blasts away the top of the volcano or causes it to collapse inward. The circular "dent" that results on top of the volcano is a caldera, which can be several kilometers wide. A caldera-causing eruption is the most devastating type of volcanic eruption. It permanently alters the environment of the surrounding area.
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| Post dates | Users | rates | Contents |
|---|---|---|---|
| 2014-02-04 | nishith | 70.00 | Check this speaking |
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