PLate Tectonics Flashcards
Crust
the outermost shell of a rocky planet
Mantle
Layer of molten rock between that crust and core
core
made up of mostly iron separated into the outer core molten and inner core solid
TEctonic plate
the layer of rock that makes up the other part of the earth including the crust topicality plast
continental drift theory
The theory that continents gradually drift over time to their positions
Asthenosphere
A thin layer of earth about. 150 miles thik at the border between the mantle and the crust
convection current
the process in which the hotter parts of gas or liquid rise to the top and the cooler denser parts sink
convergent boundary
when two tectonic plates come together
mountains
uplift of crustal plates that from elevated landmasses
Volcanos
A vent or fissure in earth’s surface through which magma and gases are expelled
Divergent boundary
when tectonic plants slit apart
Transform boundary
when tectonic plates slide past each other
flault
breaks in the crust the movement causes seismic waves which produces earthquakes
mid ocean ridge
A long ridge of volcanoes between two diverging oceanic
subduction zone
a place where one tectonic plate sinks under anther and melts also forms a trench