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This Concept Map, created with IHMC CmapTools, has information related to: Shelley Christensen Cues08, magma develops then a volcanic eruption occurs, older rivers and streams change their course then they have to move around the volcano, edge of heavier oceanic crust begins to dive under the lighter continental crust then sediments on top are pushed into deep hotter regions of the earth, hypothesis of seafloor spreading involves magnetic stripping, natural disasters occur like tornadoes, volcanic activity involves lava, hypothesis of seafloor spreading reflects on a period of reverse magnetism, convergent plate boundaries types are continent-continent, where ocean and land plates meet the ocean plates push under the land plates, rocks are made up of 2 or more minerals, erosion can cause rapid downcutting, valleys and small canyons appear then sediments are carrie by rivers and streams, plate tectonics is a theory that helps explain why volcanoes and earthquakes occur where they do, properties which identify them are luster, the composition of the rock could be silt, a volcanic eruption occurs then older rivers and streams change their course, plate tectonics explains new growth, seismic waves move out from the focus, earthquakes can cause surface faulting, weathering takes place like erosion