Plate Tectonics,Earthquakes and Volcanoes
By sheyladaniels, Updated
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What up homies! The name's Alfred Wegener. The theory I created was Pangea, which is the theory that all 7 continents were 1 and seperated because of continental drift and tectonic plates.
Strike-Slip and shearing is the process when two plates move together horizontally.Faulting follows when rock breaks and tension is the stretching of plates.
Subduction is when the collision of two plates result in one being overridden by the other plates and crust is the thinnest layer including oceanic crust is denser than continental crust and is about 5 to 8 km thick, and continental crust is less dense and is about 30 km thick. Density is mass divided by volume.
Divergent boundaries are when plates move apart from each other. A convection current is a process when hot material rises,cools,reheats,rises and repeats. Mid-Atlantic Ridge is an example of a divergent boundary.Sea floor spreading is when magma flows through the ocean floor.
The epicenter is where the earthquake starts, P waves travel ahead of S waves which are slower secondary waves.A seismograph records seismic waves.A Richter scale measures the magnitude of an earthquake and triangulation is finding the location using other locations.
Volcanoes aren't always explosive, some are non explosive.The RIng of Fire is a major area in the basin of the Pacific Ocean where volcanoes and earthquakes occur . Shield volcanoes are built from lava from continued non explosive eruptions and cinder volcanoes are small cones made entirely of pyroclastic material from moderately explosive eruptions.
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