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The process by which soil and rock are removed from the Earth's surface by wind or water flow, and then transported and deposited in other locations. The geological process by which sediments, soil, and rocks are added to a landform or land mass by wind, ice, and water, as well as sediment flowing via gravity. The difference in altitude represented by the space between two contour lines on a map. This was a supercontinent that existed during the late Paleozoic and early Mesozoic eras, forming approximately 300 million years ago. A German scientist most remembered for advancing the theory of continental drift in 1912, which hypothesized that the continents were slowly drifting around the Earth. Created by plate tectonics which include volcanoes, trenches, ocean ridges, mountains, rivers, lakes, geologic formations, faults, and aquifers. The leading edge of a cooler mass of air, replacing (at ground level) a warmer mass of air, which lies within a fairly sharp surface trough of low Crustal Features Warm Front Convection Currents Erosion High & Low Pressure Systems Deposition Pangaea pressure. Defined as the transition zone where a warm air mass is replacing a cold air mass, generally move from southwest to northeast and contains warm, moist air. Alfred Wegener Are caused by the very hot material rising, then cooling, sinking again and then heating, rising and repeating the cycle over and over. They occur in plate tectonics, ocean currents and the wind. Cold Front Determine wind and weather patterns. High pressure is associated with light winds and clear skies; low pressure cloudy skies and variable winds. Contour Interval