The crust was the outermost layer of a planet. It surrounded the mantle.
The crust of a planet was often subject to seismic disturbances. Seismic regulators were used to control this activity. (TNG: "Time's Arrow"; DS9: "Let He Who Is Without Sin...")
Most of the eisillium deposits on Archer's Comet were twenty meters below the crust of the comet. (ENT: "Breaking the Ice")
Terra 10 was a planet with a crust that was entirely crystalline. (TAS: "The Terratin Incident")
In 2365, Wesley Crusher and a team of geologists discovered that a planet had become unstable because unusually high levels of dilithium in the crust had formed a matrix which created a piezoelectric effect that was tearing the planet apart. This effect translated geothermal energy into mechanical force. (TNG: "Pen Pals")
In 2371, thirty percent of the crust of the Founders' homeworld was destroyed by weapons fire from starships above during the Battle of the Omarion Nebula. (DS9: "The Die is Cast")
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