Volcanoes

Volcanoes







    Where molten rock erupts from an opening on earth’s surface, volcanoes devepled. Most of them form near the edges of tectonic plates.
Molten rock called magma is formed in a few places deep in earth’s crust or even in even in the mantle. lf magma reaches the surface it is called lava. Large volcanoes called stratovolcanoes are build by a series of eruptions, with each one adding a layer of slodified lava and ash on top of the last. Volcanoes are classed as active, dormant, or extinct, based on how often they erupt. An ‘’active volcanoes is one that is known to have erupted in recent history. A volcano that has not stopped erupting altogether is extinct.’’ Some small volcanoes erupt just once, while a large volcanoe can erupt thousands of times over its lifetime.




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Lava flow 

   Some volcanic eruptions produce runny flows of lava lnstead of explosion with ash clouds.the lava travel steadily downhill away from the volcano, usually moving at a speed slighty slower than a running person. Mud pool is the hot steam and other gases escaping near a volcano can produce mud pools at the surface. They are not ‘’ boling’’-the bubbles are formed by escaping gases, which can be smally.