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openings where ash escapes into the atmosphere; opening at Earth's surface where volcanic materials escape
a crack in the earth's crust that allows magma to travel through and eventually reach the surface
fragments of volcanic rock and lava that are blasted into the air in large explosions; typically made of rhyolite
a crater that is more than 1 km long; an enlarged crater; formed when the summit of the volcano is weak and collapses
volcanoes produce lava which hardens into rocks; two examples are pumice and obsidian
Magma low in silica (flows easily, low viscosity), produce Panhoehoe and AA lava; Shield volcano; example is Hawaiin Islands
Has magma high in silica (high viscosity, flows slowly), Magma builds up in the volcanoes pipe and gasses inside the magma build pressure and then expolde, incredible force of eruption;
Composite volcano Cinder Cone
Composite: can have an explosive or quiet eruption, taller than cinder cone volcanoes; has one vent
Cinder Cone: explosive eruption, smallest type of volcano, has one vent
Cinder Cone vs. Shield Volcano
Cinder Cone: smallest type of volcano, has steep sides, explosive eruption
Shield: has multiple vents, has broad gentle slopes
Composite vs. Shield Volcanoes
Composite: has only one vent, formed on convergent boundary, can have explosive or quiet eruption
Shield: has multiple vents, has broad gentle slopes, can form at a hot spot
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