read the following and analyse. "The on which we live is still being changed the earthquakes,volcanoes,subduction of land and rise mountains due to processes happening deep down inside the earth."
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Plate tectonics is the grand unifying theory in geology. It gets that title because many topics in geology can be explained, in some way, by the movement of tectonic plates. Tectonic plates are composed of Earth’s crust and the uppermost, rigid portion of the mantle. Together they are called the lithosphere. Earth’s crust comes in 2 “flavors”: oceanic and continental (Table 1.1).
Table 1.1 – Comparison of oceanic and continental crust.
Property Oceanic Crust Continental Crust
Thickness 7-10 km 25-80 km
Density 3.0g/ cm3 2.7g/ cm3
Silica (SiO2) Content 50% 60%
Composition Fe, Mg, and Ca silicates K, Na, and Al silicates
Color Dark Light
Lithospheric plates move around the globe in different directions and come in many different shapes and sizes. Their rate of movement is millimeters to a few centimeters per year, similar to the rate that your fingernails grow. Motion between tectonic plates can be divergent, convergent, or transform. In divergent boundaries plates are moving away from each other, in convergent boundaries plates are moving toward each other, and in transform boundaries plates are sliding past each other. The type of crust on each plate determines the geologic behavior of the boundary.
The six types of plate tectonic boundaries and their motions.
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