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Glesmann Plate Tect
Chapter 3 lesson
Question | Answer |
---|---|
continental drift | hypothesis that continents were once joined together then moved apart |
pangaea | supercontinent that formed 300 million years agao |
midocean ridge | undersea mountain range where new ocean floor is made at divergent boundaries |
seafloor spreading | process of molten rock rising from the mantle creating new crust |
deepocean trench | deep valley on the ocean floor where oceanic crust sinks toward the mantle |
subduction | oceanic crust sinks under a deep-ocean trench to the mantle |
plate tectonics | theory that Earth's plates are in constant motion on the mantle |
fault | crack in Earth's crust where plates slide past each other |
divergent boundary | where two plates move away from eachother |
convergent boundary | where two plates come together |
transform boundary | where two plates slide past each other in opposite directions |
constructive force | any natural process that builds up Earth's surface |
destructive force | any natural process that breaks down Earth's surface |