https://siris-libraries.si.edu/ipac20/ipac.jsp?&profile=liball&source=~!silibraries&uri=full=3100001~!407041~!0#focus ...
Over millions of years, the Earth’s upper layers have performed a dance that has created mountains, volcanoes, continents, ridges and ocean trenches. Tectonic plates play a key role in this process.
Hawaii Volcanoes National Park, Hawaii -- Mount St. Helen's National Volcanic Monument, Washington -- Lassen Volcanic National Park, California -- Aniakchak National Monument and preserve, Alaska -- ...
American Samoa is a United States territory which comprises the easternmost islands of a volcanic island chain formed by the Samoan hotspot in the South Pacific Ocean. Its small islands are the tops ...
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