Terms in this set (30)
Lava with a rough fragmented surface that forms when the lava flows at very fast speeds.
A volcano that could errupt at any time or is erupting.
Extrusive igneous rock formed when runny lava cools and becomes lava.
Large circular crater formed when the top of the volcano collapses.
Light fragments of lava between 63 mm and 30 cm in size.
Steep conical hill formed above a vent usually less than 250 m high.
Cone shaped volcano formed by alternating layers of lava fragments and rock particles.
Innermost hottest layer of earth.
Bowl shaped opening at the top of the volcano.
Thin outermost layer of the earth.
Volcano that is currently inactive but may erupt.
Manner in which volcanic materials are expelled on earths surface, ranging from explosive outburst to noiseless lava flows.
Volcano unlikely to erupt.
Extrusive Igneous Rock
Lava that cools and hardens quickley at or above the surface of Earth.
Vent or opening giving off gases or steam.
Intrusive Igneous rock
Rock formed from cooling of magma below the surface of the earth.
magma that has reached earths surface
Molten rock inside Earth.
Pool of magma in the crust of earth.
Middle layer of earth, cooler than the core but hotter than the crust.
Forms when lava flows at slower speeds, cooling slowly; it has a smooth and ropy texture.
Volcanic rock formed when volcanic gases mixed with lava cool trapping bubbles of air inside.
Rapidly flowing hot gas and ash traveling down the side of the volcano.
Broad , cone shaped volcano with wide base and large bowl shaped opening at the top.
(see Composite Volcano)
Opening in earths surface through which volcanic material is released.
Measure of how a liquid flows
Small fragments of rock and lava less than 2 mm blown out of a volcano vent.
Large, round lava fragment thrown out of a volcano during an eruption.
Raised area with openings through which ash, gases, and molten rocks are or have been ejected.
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