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LanaBivins-Unit 3 V
Plate tectonics
Term | Definition |
---|---|
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. |