plate tectonics Flashcards
(17 cards)
crusty
the outermost
mantle
layer of molten rock between the crust and core
core
made up of Iron SEprated into the outercore ( molten) and iner core ( solid )
Tectonic Plate
the layer of the rock that makes the outer part of the earth including the crust and upper mantle ( lithosperic plates)
Continental drift theory
the theory that continents gradually drifted over time to their present positions
astetosphere
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 parts of the gas or liquid rise to the top and the the cooler and denser parts
convergent Boundery
when two tectonic plates come together
Mountains
Uplift of cruystails from plates that form elevated landmasses
volcanoes
a vent or fisssure in earth surface throgh which magma and gases are expelled
divergent boundary
when tectonic plates spilt apart
transform boundary
when tectonic plates slide each part each other
subduction Zone
q place where one tectonic plate sinks under another and melts also forms a trench
fault
breaks in the crust . THE movement causez the seisemic vaves which produces earth quakes
Mid ocean Ridge
a long
Mid ocean ridge
a long ridge of river of underwater volcanoes between two diverging oceanic plates
Rift valley
a long narrow between two diverging continental plates
