This causes a collision or subduction. This will result in the formation of volcanoes and mountain ranges. a shaking or sliding of the ground. It is caused by the sudden movement of masses of rock along a fault or by changes in the size and shape of masses of rock far beneath the earth's surface. plate. a rigid layer of the Earth's crust that is believed to drift slowly.
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1 You can use any text editing software to do this, such as Microsoft Word, OpenOffice, or Text Edit. If the letter is urgent or the recipient prefers email, you can send an email instead.  When addressing your current boss or coworker, you can be slightly less formal.