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Rock Gallery: Photos of igneous, sedimentary and metamorphic rocks.
Emerald is the most popular green gemstone in the United States and most of the world.
Salt Domes
Salt Domes - Salt structures that are often associated with oil and natural gas accumulations.
Tallest Mountain
Tallest Mountain - Everest has rivals in tallness, altitude and distance to the center of Earth.
Quartzite is metamorphic rock formed when sandstone is subjected to heat and pressure.
Minerals: Information about ore minerals, gem materials and rock-forming minerals.
June 6, 1912 - The most powerful volcanic eruption of the 20th century.
Rock Art
Rock Art - People have been marking on rocks for thousands of years.