Friday, December 24, 2010

STRUCTURE OF THE EARTH

STRUCTURE OF THE EARTH

The earth as it today is just the latest phase in a constant process of evolution which has occurs over the past 4.5 billion years. The earth's continents are neither fixed nor stable ,over the course of the earth's history,propelled by currents rising from the intense heat at its center ,the great plates on which they lie have moved ,collided, joined together and seperates .these processes continue to mold and transformed the surface of the earth ,causing earth quakes and volcanic eruptions creating oceans ,mountain ranges ,deep ocean trenches ,and island chains.

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