How are volcano openings formed ?
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Volcanoes are openings, or vents where lava, tephra (small rocks), and steam erupt on to the Earth's surface. ... Through a series of cracks within and beneath the volcano, the vent connects to one or more linked storage areas of molten or partially molten rock (magma).
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Cinder cones are the smallest type of volcano and are formed as small rock fragments (tephra) and ash solidify around a cylindrical vent to form a circular cone. Cinder cones normally have a bowl-shaped crater .
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