Subduction in the Pacific Northwest (04:14)
Washington State’s coastline lies above a subduction zone where ocean crust slides beneath continental crust. Water is carried into the mantle, helping to melt rock and supply volcano magma. Geoscientists study Olympic Peninsula plate tectonics.
Earthquakes: Episodic Tremor and Slip (03:26)
Geoscientists install seismometers to record earthquakes up to 200 kilometers below the Earth's surface. Images show the Juan de Fuca plate subducting beneath the North American plates. Energy released causes earthquakes and slower episodic tremor and slip (ETS) events.
Scablands of Washington State (04:28)
Geoscientists study Eastern Washington's unique topography from the air. As North American glaciers retreated 18,000 years ago, meltwater created Lake Missoula that built up behind an ice dam, creating conditions for a catastrophic flood.
Great Lakes (04:04)
The Great Lakes formed meltwater when glaciers retreated from the last ice age. Scientists study Lake Superior's geology, biology, and chemistry, including glacial Lake Duluth remnants. Superior’s eastern end is gradually rebounding from glacial pressure.
Chesapeake Bolide (03:29)
About 35 million years ago, a comet or asteroid struck the U.S.; ocean water filled the crater. Seismic reflection data revealed its shape in the 1990s. A mile long drill core helps scientists piece together what happened.
Modeling Deltas (02:59)
The Hudson River deposits sediment into the Atlantic Ocean, creating an 8.5 mile thick sediment base. Oil and gas form in sediment basins over time. Scientists model deltas to study sand and mud distribution and predict natural resource deposits.
Mining Minerals (02:52)
Geologic processes leave metal and mineral deposits exposed at the surface. Today, there is exponential demand for mineral resources. At the San Xavier Mining Laboratory, students learn how to identify fractures and ore zones.
Earth's Magnetic Field (06:09)
Learn about Earth’s formation and its shield protecting against solar particles. Without it, the planet would lose its atmosphere and become lifeless. Electric currents in the molten outer core draw field lines in and out of the iron inner core.
Credits: Tool Kit for Teachers: Videos—Visions of Earth (01:06)
Credits: Tool Kit for Teachers: Videos—Visions of Earth
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