geology

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• The Mariana Trench
  The deepest place on Earth: a subduction trench reaching 10,935 meters at Challenger Deep, with its own fauna, chemistry, and a handful of human visitors.
• Fossilization
  The rare sequence of processes that preserves remains or traces of ancient organisms in the rock record.
• The Rock Cycle
  The model describing how igneous, sedimentary, and metamorphic rocks form and transform over geological time.
• Plate Tectonics
  The theory that Earth's outer shell consists of moving plates whose interactions build mountains, open oceans, and trigger earthquakes and volcanoes.