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34 Cards in this Set
- Front
- Back
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Volcano
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vent and the pile of volcanic material around the vent
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Vent
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opening from which lava flows
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Crater
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funnel-shaped pit at the top of a volcanic cone
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Quiet Eruption
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lava flows gently to the surface. It spreads out and forms a large mountain.
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Explosive Eruption
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volcanos formed by explosive eruptions have steep sides and narrow bases. Cinder cones
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Dormant
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a volcano is said to be " sleeping"
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Extinct
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is not expected to erupt anymore.
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Composite Cone
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both quiet and explosive eruptions occur in the same volcano. During quiet, lava forms a wide base. Explosive, adds a layer of dust, ash, and rock particles. Very high cone, steep sides wide edges.
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Shield Cone
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gentle slopes
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Magma
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the molten mixture of rock forming substance, gases and water from the mantle
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Ring of Fire
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a major belt of volcanoes that rims the pacific ocean
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Island Arc
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a string of islands formed by volcanoes along a deep ocean trench
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Hot Spot
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an area where magma from deep within the mantle melts through the crust above it. Random, thin crust
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Volcanoes form
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plate boundaries
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Diverge
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pull apart
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Converge
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pull together
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Temperature
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as this increases viscosity decreases
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Caldera
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created by the collapse of a volcanoes magma chamber
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Viscosity
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the resistance of a liquid to flow
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Silica
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an ingredient in magma and lava
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Tsunami
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triggered by earthquakes on ocean floor
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Active
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a volcano that is showing signs that it may erupt in the future
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Magma Chamber
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underground pocket of magma under a volcanoes pipe
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Bomb
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largest of the lava rock fragments
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Lava
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melted igneous rock on earths surface
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Pipe
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connects magma chamber to the surface
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Ash
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smallest of the lava rock fragments
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Compound
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a substance made of two or more substances
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What is a Caldera
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it's something that's created by the collapse of a volcanos magma chamber
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What is Silica
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an ingredient in Magma and lava
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How do Tsunamis occur
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they are triggered by earthquakes on the ocean floor
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What are vents
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Lava and gases leave volcanos through areas called vents
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what is dormant
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a sleeping volcano that scientists expect to errupt in the future
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what is a geyser/ how does it form
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it forms from the heating of underground water
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