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Theory of Plate Tectonics
Transcript of Theory of Plate Tectonics
Theory of Plate Motion
Earth's lithosphere, like a dropped hard boiled egg, is broken in irregular pieces.
Theory of Plate Motion Con't
No plate can budge without affecting the other plates surrounding it.
The edges of different pieces of the lithosphere meet at lines called plate boundaries and they extend deep into the lithosphere.
Crust is neither created nor destroyed.
The place where two plates move apart, or diverge, is called a
divergent plate boundary
The place where two plates come together, or converge, is called a
Move extremely slow: about 1-10 centimeters per year.
The pieces, or separate sections of the Earth are called
; they fit closely together along cracks int he lithosphere.
Plate tectonics is the geological theory that states that pieces of Earth's lithosphere are in constant, slow motion, driven by convection currents.
The theory of plate tectonics explains the formation, movement, and subduction of Earth's plates.
Move from the convection currents in asthenosphere. Just floating on top.
Cause changes in the world such as volcanoes, mountain ranges, and deep-sea trenches.
, breaks in Earth's crust where rocks have slipped past each other, form along plate boundaries.
Three kinds of boundaries:
A place where two plates slip past each other, moving in opposite directions.
Earthquakes occur frequently along these boundaries.
Most divergent plate boundaries occur at the mid-ocean ridge. They also occur on land, when two of Earth's plates move apart.
A deep valley called a
forms along the divergent boundary, like the Great Rift Valley in east Africa. As the rift valley widens, the floor drops making the land more susceptible to the sea flooding.
Three types of collision:
oceanic crust and oceanic crust
Most dense plate dives and melts in magma, creating a subduction area.
oceanic crust and continental crust
Most dense plate, oceanic crust, dives and melts in magma, creating subduction and deep-ocean trenches.
continental crust and continental crust
Equal density, creates mountain ranges.
When two plates collide, density determines which one will go on top. Oceanic crust is made of Basalt, making it denser than continental crust, made mostly out of Granite.
What is the closest comparison of continental movement speed?
a. fingernail growth
b. sunflower growth
c. bacterial growth