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Local Tsunamis in the Pacific Northwest | U.S. Geological Survey Block diagram of a subduction zone when two oceanic plates converge. [source: This Dynamic Earth] The Pacific Northwest is the site of the Cascadia subduction zone, where an oceanic tectonic plate (the Juan de Fuca plate) is being pulled and driven (i.e., subducted) beneath a continental plate (the North American plate). Oil spill - Wikipedia Around 40-50% of all oil released into the oceans stems from natural seeps from seafloor rocks. This corresponds to approximately 600,000 tons annually on a global level. While natural seeps are the single largest source of oil spills, they are considered less problematic because ecosystems have adapted to such regular releases. Unit Plan | Stage 3: Plate Tectonics – Science – Grade 8 ... Adaptation: Have students label a diagram of the earth. Extension: Students can create an analogy to the syrup and cracker. Adaptation: Have students label a convection diagram. Looking ...