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| This theory was first proposed by Alfred Wegner and describes the slow movement of continents. |
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The measurement of mass per unit volume of an object.
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| Process that occurs at mid-ocean ridges, where new oceanic crust is formed. [image] |
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Scientist who initially developed the theory of plate tectonics.
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Scientist who developed and proved the sea-floor spreading hypothesis.
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Heat transfer that occurs in the mantle, and the driving force for plate tectonic movement.
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| The outermost rocky layer of planet Earth. |
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| The thickest layer of Earth mainly composed of molten rock. |
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| This layer of the Earth, is "crunchy" and is composed of the crust and plates. |
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This molten layer of the Earth is part of the upper mantle,found just below the lithosphere.
Its jello like composition allows the plates above it to move.
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| The densest, hottest, and innermost layer of the Earth. It is mainly composed of nickel and iron metal. |
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| This liquid layer of the Earth is made up of iron and nickel. It is found right below the mantle. |
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In this type of boundary, the plates move in opposite direction away from each other.
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In this type of boundary, the plates move towards each other.
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| In this type of boundary, the plates slide past each other. [image] |
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This underwater mountain system forms when two plate diverge. New magma rises in the middle of this boundary forming new ocean floor.
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| These landforms typically form when two contiental crusts converge (collide). The Himalayas serve as an example of this.[image] |
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This forms when an oceanic crust and a continental crust converge (collide) resulting in a subduction of the oceanic crust with a depression (low) area between the two crusts.
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| A low area (zone) that forms when two plates converge (collide) and the densest plate ends up below (subducting). [image] |
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This results when oceanic crust subducts below continental crust. The pressure from the oceanic crust subducting, causes magma to be pushed up the continental crust.
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A fracture or crack in the rocky crust as a
result of plate tectonic movement.[image] |
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An area where a large number of earthquakes and volcanic eruptions occur in the basin of the Pacific Ocean.[image]
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| A change in the Earth's magnetic field such that the position of magnetic north and magnetic south are reversed. This can be seen and examined in sea floor spreading sites such as mid-ocean ridges. [image] |
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| The densest type of crust, mainly composed of basalt rock. |
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| The less dense type of crust. It is mainly composed of granite rock. |
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| This type of crust is found in the outermost areas of a mid-ocean ridge. [image] |
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| This type of ocean floor (crust) is found and formed at the center of a mid-ocean ridge.[image] |
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| A tremor that results from a sudden release of energy in the Earth's crust that creates seismic waves. |
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| S-waves and P-waves of energy that are released during an earthquake. |
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| A series of giant tidal waves caused by the dispalcement of a large body of water. Generally caused by earthquakes or underwater volcanic eruptions. |
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| Thius type of igneous rock is generally found in oceanic crust. [image] |
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This type of metamorphic rock is generally found in continental crust.
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| According to the continental drift theory, this supercontinent existed as a giant land mass before the continents started drifting away about 200 million years ago.[image] |
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| Instrument that measures the motions of seismic waves during earthquakes.[image] |
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| The force that drove the formation of our solar system, planetessimals, and Earth. [image] |
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The most widely accpeted model explaining the formation of our solar system including Earth. It suggests that a large cloud of dust and debris clumped together and formed larger bodies of matter due to collisions and gravitational pull.
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