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Whit Plate Tectonics
plate tectonics, earthquakes, volcanoes
Term | Definition |
---|---|
mantle | thickest layer of earth made of iron and magnesium |
oceanic crust | more dense layer of crust that sinks during subduction |
pangaea | super continent |
transform boundary | boundary where two plates slide past |
convection currents | 'bubbling' in the mantle, responsible for making plates move |
divergent boundary | two plates move away from each other |
convergent boundary | two plates collide |
mountains | created when two continental plates collide |
mid-ocean ridge | created at a divergent boundary and creates new crust |
subduction | one plate slides under another and crust is destroyed |
epicenter | point on earth's surface where the earthquake is strongest |
focus | point inside earth where earthquake begins |
magnitude | strength of an earthquake |
seismic waves | earthquake waves that travel outward in all directions |
fault | crack in earth's crust |
earthquakes | what happens a lot at transform boundaries |
alfred wegner | who came up with the theory of continental drift? |
ring of fire | area of high volcanic and seismic activity in the pacific |
hotspot | hot area of the mantle that rises up and creates volcanoes and islands |
lava | what magma is called once it reaches earth's surface |