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Volcanoes are our most explosive landforms able to eject molten rock and clouds of thick ash high into the atmosphere with devastating consequences [Music] volcanoes mostly occur along destructive and constructive plate boundaries where plates are pushed together or dragged apart [Music] cracks or weaknesses allow magma to rise up from below the Earth's crust [Music] pressure builds up which then releases suddenly causing the magma to explode a volcanic eruption [Music] magma that reaches the Earth's surface is called lava this molten lava eventually cools to form new rock [Music] after more eruptions over time the mound of rock builds up forming a cone-shaped volcano [Music] volcanoes all have the same key structure a collection of magma underneath the volcano forms a hot bubbling furnace called the magma chamber the main vent allows this magma to escape and secondary vents a smaller outlet the magma can travel through the caved-in surface is called the crater it's created after an eruption blows the top of the volcano eruptions occur when pressure forces magma from the chamber up the main vent towards the crater if the ash and mud from a volcanic eruption mixed with rainwater or snow it creates fast-moving mud flows the hot lava and overwhelming mud flows can destroy huge areas however volcanoes are also essential for life on our planet scientists believe that volcanoes formed Earth's first atmosphere by spewing water vapor sulfur dioxide nitrogen and carbon dioxide into the air and volcanic eruptions continue to contribute to the carbon cycle crucial to life by releasing carbon dioxide they can go through long periods of being very active, but they may also become dormant not erupting for hundreds or thousands of years, and eventually they can become extinct just leaving a cone-shaped Hill that never erupts again
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