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While the USS Enterprise-D was attempting to help the planet of Penthara IV by drilling into the surface with phasers, the drilling destabilized the stable tectonic plates and the mantle began collapsing around the bore sites, causing several volcanic outbreaks and severe earthquakes. (TNG: "A Matter of Time")
While lost in the Delta Quadrant aboard the Delta Flyer, Tom Paris, Samantha Wildman, and Tuvok discovered a Class M planet with a benamite mantle and several active volcanoes. (VOY: "Once Upon a Time")
The planet Sikaris had a mantle of tetrahedral quartz twenty kilometers thick. The crystalline structure of the planet's mantle served as an amplifier for the Sikarians' spatial trajector technology. (VOY: "Prime Factors")
According to an Alpha Hirogen hunter, at least one collapsed star in the Delta Quadrant had a neutronium mantle. The hunter claimed to the crew of Voyager that he tracked a silicon-based lifeform through this mantle. (VOY: "Prey")