Plate Tectoics Flashcards
CRust
The outermost shell of a rocky planet
Mantle
Layer of molten rock between the crust and core
Core
Made up of mostly lron. Separated into the outer core ( molten )
and inner core ( solid)
Tectonic plant
The layer of rock that makes up the outer part of the Earth , including the crust and upper mantle ( lithospheric plates)
Continetal Drift theory
The theory that continents gradually difted over time to their present positione.
Asthenosphere
A thin layer of Earth, about 150 miles thick, at the border between the mantle and the crust
Convection current
The process in which the hotter of a gas or liquid rise to the top and the cooler, denser parts sink
convergent Boundaey
When two tectonic plantes come togther
Volcanoes
A vent or fissure in Earth’ s surface through which magma and gasses are expelled
Divergent Boundary
when tectonic lates split apart
Transforom Baundary
When tectonic plates slide past each other
Fault
Breaks in the crust. The movement causes seismic waves which produces earthqukes
Mio- Ocean Ride
A Long ridge of underwater volcanoes between two diverging oceanic plates
Subdcction Zone
A place where where one tectonic plate sinks under anther and malts. Also forms a trench.