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When a volcano erupts, hot gases and melted rock from deep within Earth find their way up to the surface. This material may (1) slowly out of a crack in the ground, or it may explode suddenly into the air. Volcanic eruption is may be very (2) . But they can (3) create new landforms. Of the nearly 1 ,900 volcanoes active today, or known to have been active in (4) times, about ninety per cent can be found in the (5) of South America, North America, Asia, and Oceania that are close to the Pacific Ocean. 1__________2__________3__________4__________5__________
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