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Anna Soignoli unit 3

Plate tectonics (unit 3 vocab)

TermDefinition
Asthenosphere Highest layer on the earths mantle, but still lower than the lithosphere
Subduction Process where two tectonics plates collide
Seafloor spreading Theory that the oceanic crust was created at the ocean ridges
Mantle convection Convection currents in the mantle that are thought to be the main cause of plate movements
Ridge push process connected to convection currents in the earths mantle , occurs when the weight of a elevated ridge pushes an oceanic plate towards a subsection
Slab pull Tectonic process involved with convection currents, occurs when the weight of a subduction plate pulls the lithosphere into a subduction zone
Lava Magma flowing onto the earths surface
Magma molten rock below the earths surface
Tectonic plates pieces of the crust that covers the earths surface
Theory of continental drift Wegeners theory that earths continent were once one big super continent called Pangea
Convergent boundary place where two tectonic plates will move toward each other
Divergent boundary where two of earths tectonic plates will moving apart
Transform boundary Place where two tectonic plates end up sliding horizontally away from each other
Hot spot A hot area in the earths mantle
Epicenter(in regards to earthquakes) Point on Earths surface directly above the focus of an earthquake
Focus(in regards to earthquakes) point of the initial fault rupture where an earthquake originates
Pangaea A landmass made up of all the continents that had supposedly began to break up around 200million years ago
Geo hazard Geological dangers that may cause changes to the Earth's surface
Reverse fault Formed by vertical and horizontal compression, it causes a vertical movement upwards along a fault plane
Strike-slip fault Caused by horizontal shear that causes horizontal movement along a fault plane
Normal fault Its tension causes vertical movement downwards along a fault plane
Compression Stress that decreases the volume of a material
Tension Stress that pulls a material apart
Shearing Stress that causes a material to twist
Felsic Light colored igneous rock
Mafic Dark Colored igneous rock that are made of more lighter elements that are more buoyant
Created by: AnnaSoignoli
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