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Part 5 - Forces Inside Earth A. Moving Earth • Pangaea (Alfred Wegener) – • Forces inside the Earth are constantly reshaping its surface • Theory of Plate Tectonics – • Plates include continents, parts of continents, and parts of the ocean floor. • Plates sit on streams of nearly melted rock called magma • Magma acts as a conveyor belt moving plates around B. Earthquakes • Occur when plates slide together • They often happen at seams in Earth’s crust known as faults • Faults - • Some go unnoticed, but some destroy buildings and cities C. Volcanoes • Movement of continental plates creates great pressure inside the Earth • Volcanoes - • Lava - • Volcanoes also blast large amount of rocks, ash, and poisonous gases into the air during an eruption D. Natural Hazards • Environmental events that threaten people’s lives and property • Include volcanoes, earthquakes, tornadoes, landslides, and floods. • People who live in these areas usually take precautions to protect themselves • Architects now design buildings to withstand natural disasters