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8th Grade Science

Volcano

QuestionAnswer
volcano vent or fissure to Earth's surface through which magma and gases are expelled
magma hot molten rock below the Earth's surface
lava hot molten rock above the Earth's surface
viscosity resistance of a liquid to flowing
tectonic plates the lithosphere broken up into pieces like a puzzle
Ring of Fire Major volcanic belt- arounnd rim of the Pacific
Plate Boundary where two or more tectonic plates meet
Mid-Ocean Ridge huge underwater mountain chain
subduction when the plates collide and one gets pushed beneath the one into the mantle
volcano vent or fissure to Earth's surface through which magma and gases are expelled
magma hot molten rock below the Earth's surface
lava hot molten rock above the Earth's surface
viscosity resistance of a liquid to flowing
tectonic plates the lithosphere broken up into pieces like a puzzle
Ring of Fire Major volcanic belt- arounnd rim of the Pacific
Plate Boundary where two or more tectonic plates meet
Mid-Ocean Ridge huge underwater mountain chain
subduction when two plates collide and one gets pushed beneath the other into the mantle
convection movement of matter due to differences in density from heating and cooling (hot things rise up and cool things sink)
hot spot a volcanically active area of Earth's surface, commonly far from a tectonic plate boundary
mantle plume unusually hot spot in the mantle
pyroclastic flow a mixture of hot gases, ash, cinders (pebble size), ex bombs large pieces- BB to car)
volcanic crater opening/depression at the top of the volcano
vent the opening at the surface of Earth through which volcanic material passes
magma chamber a large opening full of magma
cone the mountain shaped portion of the volcano
caldera when a magma chamber collapses it may leave an even bigger depression/opening
fissures cracks in the Earth's crust
lava plateau thick mostly flattened layer of cooled lava
active volcano erupting volcano or shows signs it may erupt in near future
dormant volcano sleeping volcano- can awaken and become active
extinct volcano dead volcano; unlikely to erupt again
composite volcano tall cone-shaped mountains in which layers of lava alternate with layers of ash
Created by: SSC