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Unit 3 Vocab Leah Mo

Plate Tectonics

TermDefinition
Asthenosphere The Asthenosphere is just the upper layer of the earth’s mantle
Subduction Subduction is as a process in which one tectonic plate slips underneath another tectonic plate
Seafloor Spreading Seafloor spreading is a hypothesis in which new crust is being formed at the mid-ocean ridges and is destroyed at the deep sea of the trenches.
Mantle Convection The mantle convection is circular currents that occur within the mantle in a cycle driven by heat
Ridge push Ridge push is where the magma breaks through earth's crust and hardens creating mid-ocean ridges and pushing the crust away
Slab Pull Slab pull is older, colder, denser plates that sink at the subduction zones
Lava Lava magma that flows out onto the earths surface
Magma Magma is just the hot fluid inside of the volcano
Tectonic Plate massive, irregular shaped slab of solid rock
Theory of Continental Drift Theory that all continents were once a super continent called Pangaea
Convergent Boundary They move towards each other
Divergent Boundary They move away from each other
Transform Boundary They slide pass each other
Hot Spot The hot spot is unusually the hot area on earth's mantle where high temp plumes of mantle material rise toward the surface
Epicenter The epicenter is the point on earth's surface directly above the focus of an earthquake
Focus The focus is the point of the initial fault rupture where the earthquake originates
Pangaea The Pangaea is the landmass made up of all the continents that began to break apart
Geo-hazard The Geo-hazard is a widespread that leads to damage or risk
Reverse-Fault Reverse Fault is two blocks of rocks being forced together by compression
Strike-Slip Fault Strike-Slip Fault is vertical fractures where the two blocks are being moved horizontally
Normal Fault Normal Fault is when the hanging wall gets moved downward
Compression Compression is something getting made smaller or pressed down together
Tension Tension is pulling a force
Shearing Shearing is a force, or movement being applied to an object
Felsic Felsic is a type of igneous rock
Mafic Mafic is another type of igneous rock
Created by: leah12456
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