Question | Answer |
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 |