"A Theory of Earth´s Structure." (Part 1).
The Rule is to write Short Essays. So, I follow the Rules at this friendly Forum for Writers. This should be a Long Essay for its vast information. However, it is rather brief.
Few people who have experienced an Earthquake or witnessed a Volcanic Eruption doubt that our Planet is active, alive. When the ground that a house stands on begins to move, when a mountain suddenly grows, then there is proof that our Earth is a changing place.
Geophysicists -the Scientists who study the energy of the Earth- and Geologists -the Scientists who study rock and rock formations that make up our Planet -have put together a possible explanation of the Earth´s Structure. Their Theory is called Plate Tectonics. The surface of the Earth, according to the theory, is hard rock like a crust on a piece of bread. This cool surface floats on the melted rock (called magma) that is below the surface. Like thick, slow-moving ice packs on the top of the Arctic Ocean, the surface of the Earth also moves. Weak places become cracks in the Arctic ice; similarly, there are cracks in the Earth´s rock. The theory of Plate Tectonics explains that the present form of the land masses of Earth are moving away from one great land mass. Once, according to the theory, all land was connected (as Pangaea).
When activity deep inside our Planet causes pressures and tensions in the rock, the pieces of the Earth that are called plates move (an Earthquake), or the pressure finds a way to be released (through a natural escape valve in the crust of the Earth, a Volcano).
Evidence that supports the Theory of Plate Tectonics is plentiful. Aerial photographs and Satellite pictures show deep valleys, cuts, and trenches in the Earth. These trenches are clues for the arrangement pattern of the surface plates. In addition, Earthquake experts have found and identified places where ground motion is likely to occur. Along these cracks or faults, the experts measure the shock waves that are caused by the small tremors or movements that come from deep underground. Their measurements support the Plate Tectonics Theory.
If the Plate Tectonics Theory is indeed the explanation of the Earth´s Structure, then there are interesting implications. One implication refers to the past action of plates. According to the theory of plate tectonics, all land was once part of one great mass, PANGAEA ("all-earth", in Greek Language). Because of the movement of the plates, the land mass broke into parts as whole groups of plates moved in different directions. The continents drifted to their present places, and furthermore, the land masses are still moving. The implication for the future is how the plates are now shifting.
This Essay is a study for Advanced Students of English as a Second Language (about Course Level 6). It is rather a basic knowledge for advanced students of English.
Thank you for Reading!! (((HUGS))) Starry.
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"A Theory of Earth´s Structure."
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