Plate tectonics and magnetic reversal (4.3)

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Theory of Plate Tectonics

theory that explains how large pieces of the Earth's outermost layer move and change shape

tectonic boundary

where tectonic plates touch

pushed

At a convergent boundary plates are ______, depends on which type of plates are converging.

plates sea floor mid-ocean ridge volcanic

At a divergent boundary ____ move apart, ____ spreads, _____, and ____ activity.

laterally earthquakes

At a transform boundary plates move ____ past eachother and many ____.

collide deform thickens mountains

At continental/continental convergent boundaries both plates ____ and ____. The crust ____ as ____ are pushed upward.

older trench island arc rising magma

At oceanic/ oceanic convergent boundaries the ____ oceanic plate will sink beneath the other and a ____ is created in between the plates, an ____ is created due to ____.

oceanic crust denser continental crust trench subduction zone mountain range continental crust

At oceanic/continental convergent boundaries the ____ sinks, subducts, because it is ____ than ____. A ____ forms at the _____. _____ forms on the _____.

cools more dense sink

When rock ____, it becomes ____, and tends to ____.

heated less dense rise

When rock is _____, it becomes ____ and tends to _____ to the surface of the Earth.

Sea- floor spreading

____ takes place at a rift.

transform boundary earthquakes

_____ causes strike-slip faults and produces _____.

ridge

-build up of magma on either side of the rift

magnetic reversal

-change in the Earth's magnetic field resulting in the magnetic north being aligned with the geographic south, and the magnetic south being aligned with the geographic north.

rift

-crack, where magma rises

definition of sea-floor spreading

-the process by which new oceanic lithosphere forms as magma rises toward the surface and solidifies

oceanic/oceanic oceanic/continental

Convergent subduction occurs at ____ and ____.

thermal energy

Density changes in the asthenosphere are caused by the flow of ____ from deep within the Earth.

hot iron core

Earth's magnetic field is generated by the ____.

tectonic plates

Earth's outermost layer is called ____.

very slowly GPS Global Positioning System

Tectonic plates move ____, their speed is measured by ____ (____).

convergent boundary

boundary formed when tectonic plates collide

divergent boundary

boundary formed when tectonic plates separate

transform boundary

boundary formed when tectonic plates slide past horizontally


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