ocean basin (ocean floor) - -A valley or convergent boundary - -A plate boundary
depression between continents. Never grows where two plates move toward each other. If its
because crust is created at divergent boundaries and oceanic and continental subduction takes place. A
destroyed at subduction. trench will form below the water and volcanoes on the
surface as well as island arcs and tsunamis. If it's two
continental plates, mountains form.
seafloor spreading - -The process that creates
new sea floor as plates move away from each other
at the mid-ocean ridges. Results from tectonic plate divergent boundary - -A plate boundary where
movement. two plates move away from each other. Example-Mid
ocean ridge
Plate Tectonic Theory - -explains why the outer
layers of the Earth move and change. The plate Mantle - -This layers allows the plates to move,
movement is caused by convection currents in the shift, and flex because of convection.
mantle.
Lithosphere - -broken into tectonic plates
subduction zone - -An oceanic plate colliding
and going beneath a continental plate. This takes
place at a convergent boundary when continental mid-ocean ridge - -An undersea mountain
crust meets oceanic crust. The oceanic crust always chain where new ocean floor is produced; a divergent
goes underneath continental because it is denser. plate boundary. The further you go away from the
ridge, the older the oceanic crust will be. The ocean
floor is not expanding. Eventually old ocean floor will
volcanic eruption - -Convection currents in the meet with continental crust and subduction will occur.
mantle causes magma to rise to the surface, erupting
from the volcano. Can cause an earthquake.
Alfred Wegener - -A German scientist who
proposed the theory of continental drift.
Transform boundary - -caused by two tectonic
plates sliding past each other along a fault line;
produces earthquakes
Harry Hess - -Proposed the theory of sea-floor
spreading to support continental drift, which led to
the theory of plate tectonics.
Earthquake and volcanic eruptions occur most
frequently along - -plate boundaries
tectonic movement - -plays a role in the
formation of volcanoes and the strength of
earthquakes.
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