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bogs spongy areas that look dry but are covered with wet organic material marsh has visible standing water and supports various types of grasses swamps covered by standing water and dominated by large trees plate tectonics theory the earth's crust is composed of plates and these plates crash and pull apart from each of them resulting in earthquakes and volcanoes folding a piece of land moving upward after being pushed from both sides continental drift theory Landmasses of the earth were connected, forming a supercontinent known as pangaea. Something occurred to separate the landmasses, causing them to slowly drift apart. weathering the breakdown of rock by water, temperature, plants, ice, and mineral crystals erosion removes the materials broken down through weathering coriolis effect the movement of the land due to the rotation of the earth trade winds found in the tropics westerlies found in the middle latitudes easterlies found in the poles ocean currents circle the earth drifts slow moving currents