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Science Chapter 9
Terms in this set (15)
a vent or fissure in the Earth's surface through which magma and gases are expelled
the body of molten rock that feeds a volcano
an opening at the surface of the Earth through which volcanic material passes
lava pours out quickly and forms a brittle crust. The crust is torn into jagged pieces as molten lava continues to flow underneath.
lava flows slowly, like wax dripping from a candle. Its glassy surface has rounded wrinkles.
forms when lava erupts underwater. This lava forms rounded lumps that are the shape of pillows.
is cool, stiff lava that does not travel far from the erupting vent. Usually oozes from a volcano and forms jumbled heaps of sharp-edged chunks.
a funnel-shaped pit near the top of the central vent of a volcano
a large, semicircular depression that forms when the magma chamber below a volcano partially empties and causes the ground above to sink
a wide, flat landform that results from repeated nonexplosive eruptions of lava that spread over a large area
built of layers of lava release from repeated nonexplosive eruptions that over time create a volcano with gently sloping sides
Cinder Cone Volcano
made of pyroclastic material usually produced from moderately explosive eruptions forming steep slopes. Usually small and only erupt a short time. Commonly occur in clusters on sides of other volcanoes.
(stratovolcanoes) form from explosive eruptions of pyroclastic material followed by quieter flows of lava. They have broad bases and sides that get steeper toward the top.
an area of deep cracks that forms between two tectonic plates that are pulling away from each other
a volcanically active area of Earth's surface far from a tectonic plate boundary
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