Plate Tectonics Flashcards
Crust
The outermost shell of a rocky planet
Mantle
Layer of molten rock between the 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 outer part if the earth, including the crust and upper mantle (lithosphere plates)
Continental Drift Theory
The theory that the continents gradually drifted over time to their present positions.
Asthenosphere
A thin layer of the Earth, about 150 miles thick, at the border between the mantle and the crust.
Convection Currents
The process in which the hotter parts of a gas or liquid rise to the top and cooler, denser parts sink.
Convergent Boundary \
When two tectonic plates come together.
Mountains
Uplift of crustal plates that form elevated landmasses
Volcanos
A vent or fissure in Earth’s surface through which magma and gases are expelled
Divergent Boundary
When tectonic plates slit apart.
Transform Boundary
When tectonic plates slide past each other.
Fault
Breaks in the crust.The movement causes seismic waves which produces earthquakes.
Mid-Ocean-Ridge
A long ridge of underwater volcanoes between two diverging oceanic plates.
Subduction Zone
A place where one tectonic plate sinks under another and melts. Also forms a trench.
