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8th Grade Science
Volcano
| 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 |
Created by:
SSC 8th LA
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