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25 Cards in this Set
- Front
- Back
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aa
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jagged chunks of lava formed by rapid cooling on the surface of a lava flow
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caldera
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large basin shaped depression formed when an exlosion destroys the upper part of a volcanic cone or when the maga chamber below a volcano is emptied during an eruption.
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cinder cone
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steep sloped deposit of fragments ejected from a volcano
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composite volcano
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(stratovolcano) steep sloped volcanic deposit with alternating layers of hardened lava flows and pryoclastic materials
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crater
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a funnel shaped pit at the top of a volcanic cone
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felsic lava
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silica rich lava
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fissure
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crack in rock surface through which lava flows.
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hot spot
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area of volcanism within a lithosphereic plate.
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lapilli
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pyroclastic particles between 2 mm and 64 mm in diameter.
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lava
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magma that reaches the earths surface.
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lava tubes
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tunnels formed when still molten lava flows out from under a hardened shell
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mafic lava
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dark colored lava rich in magnesium and iron
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magma
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liquid rock produced deep inside the earth
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pahoehoe
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solidified mafic lava with a wrinkled surface.
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pillow lava
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lava that flows out of fissures on the ocean floor and cools rapidly in rounded shapes
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pyroclastic material
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the rock fragments ejected from a volcano
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shield volcano
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a cone of hardened lava that forms a broad base and gentle slopes
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stratovolcano
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(same as composite volcano)
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vent
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opening through which molten rock flows onto the earths surface
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volcanic ash
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pyroclastic particles between .25mm and 2mm in diameter
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volcanic block
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largest possible pyroclastic material that is formed from solid rock blasted from a volcanic fissure
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volcanic bomb
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large, spindle shaped clot of lava thrown from a volcano
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volcanic dust
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pyroclastic particles less than .25mm in diameter
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volcanism
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any activity that includes the movement of magma tward or onto the earth's surface
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volcano
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lava and pyroclasic material built up on the earth's surface around a vent.
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