geology and plate tectonics Flashcards
what is seismic wave
travel through earth’s interior
geology
study of earth and its structures, processes, history
where is liquid and solid core on earth
liquid= outer core
solid=inner core
plate tectonics
pangaea and its continental drift
paleomagnetism
when igneous rock cools. magnetism is frozen like little compasses. earth’s magnetic field, support plate tectonics theory
sonar
many geologists thought the seafloor was flat and featureless. wrong
how are plates of lithosphere moved
by hot mantle of convection cells
what is the longest mantle on earth
under the ocean
why does earthquake waves help find earths interior
the vibrations travel through interior by using speed and direction of the waves
radiometric dating
as rocks get older= further you are from ridge (splitting of plates)
convergent subduction boundaries
two plates moving to eachother. one plate is subducting under another plate
polar wandering
the theory that continents moved since rocks were formed
collision boundary
plates equally against eachother
oceanic-oceanic convergence
2 oceanic plate collides forming subduction zone.
trenches
when subduction zone in oceanic plates. worlds deepest seas are in trenches.
