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tect.plates - The earth's surface is made up of large...

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-1 The earth’s surface is made up of large plates, like pieces of a large jigsaw puzzle. The theory of plates began when a German scientist, Alfred Wegener, thought of the idea of Pangaea. (Plate tectonics) Pangaea is the idea that all continents were once connected as a super continent that started to break apart about 200 million years ago. He found this by originally noticing that Africa and South America seemed that it fit together like pieces of a puzzle. Though the theory was not completely understood the 1960s with use of ocean surveys where geologists started to find out how the movement occurred. These plates move a few centimeters per year. These plates are moved by convention currents. The movement of these plates have caused many geological activity since earth’s beginning. Colliding plates can cause volcanoes, mountains, and are the source of earthquakes. These plates can be classified under four different categories of plate boundaries. Today there are seven major and many minor tectonic plates that are slowly moving in different directions on earth.
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