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LanaBivins-Unit 3 V

Plate tectonics

TermDefinition
Asthenosphere It is below the lithosphere and is the upper layer of earth's mantle. As well as the rocks in this sphere are called "plastic".
Subduction When a tectonic plate slips and it then becomes beneath another plate.
Seafloor spreading The idea that when new ocean crust forms, it takes place at mid-ocean ridges. They are also going to be destroyed at deep sea trenches.
Mantle Convection The mechanism that causes plate movement.
Ridge Push Happens when an elevated ridge's weight causes an oceanic plate into subduction zone by pushing it.
Slab Pull Happens when the subducting plate's weight pulls the lithosphere and brings it into a subduction zone.
Lava The magma that leaves leaves earth and comes above surface.
Magma Made up of molten rocks, gases that are dissolved, and mineral crystals; it is located inside earth/under earth's surface.
Tectonic Plates They cover earth's surface and fit at their edges. They are also big parts of the crust.
Theory of continental drift A theory by Alfred Wegener; it is the theory that all of the continents were once together as one and was called Pangaea.
Convergent Boundary It is the place where 2 tectonic plates are moving at each other/towards each other.
Divergent Boundary The place where 2 tectonic plates are moving away from each other/apart.
Transform boundary The place where 2 tectonic plates are sliding past each other; they pass by each other horizontally.
Hot Spot An area in earth's mantle that is unusually hot. The high temperatures rise.
Epicenter located directly an earth quakes focus and it is a point on earth's surface.
Focus It is on the initial fault rupture and it is where earthquakes originate. It is also below earth's surface.
Pangaea It is made up of all of the continents; It broke apart in around 200 mya.
Geo hazard Threats to people or places and can be potentially dangerous; an environmental process; examples are landslides, slumps, creeps. etc.
Reverse fault Are results of horizontal and vertical compression and they may be seen near convergent plate boundaries.
Strike Slip fault They are caused by horizontal shear and it moves opposing directions/ in opposite directions.
Normal fault Vertical movements that are going downward along a fault plane due to tension/caused by tension.
Compression It is stress and it decreases a materials volume.
Tension A stress that takes a material and pulls it apart.
Shearing It causes a material to twist and it is a type of stress.
Felsic Igneous rocks that have a lot of the elements that are responsible for forming feldspar and quartz.
Mafic Igneous rocks that have an abundance of magnesium and iron.
Created by: 22lanab57