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Knows that molten rock from below the Earth's surface creates pressure that is released by volcanic eruptions; under the ocean basins, molten rock may well up between separating plates to create new ocean floor; and volcanic activity along the ocean floor may form undersea mountains, which may eventually become islands.

Volcanic Clouds and the Atmosphere

We frequently hear about volcanoes, eruptions, explosions, and probably think these things will never affect us, that volcanoes only exist at places far away. However, they should be a concern to everybody, since more than 50 volcanoes scattered throughout the world are active every year and their eruptions affect millions of people. Volcanic explosions produce clouds, which the atmosphere transports. This means that volcanic clouds can travel long distances and affect people that live far from their sources.

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