Soil or dirt was a mixture of organic and inorganic materials, air, and water located between a planet's lithosphere and atmosphere that supported life.
Omicron Theta was a farming planet until 2338, when its soil bacteria were taken by the Crystalline Entity, making it useless. (TNG: "Datalore")
Paterson Supra planted radishes in a special type of soil for his science fair project in 2368. (TNG: "Disaster")
When Doctor Julian Bashir arrived at a Bajoran village he had received a medical emergency message from in 2369, he scanned the air, the water and the soil but was not able to find any pollutants. (DS9: "The Storyteller")
In 2370, Draylon II possessed, among other things, good soil, making it suitable for colonization by the Skrreea. (DS9: "Sanctuary")
While going through premature elogium in 2371, Kes ate mashed potatoes, butter, and nitrogenated dirt. Later, when The Doctor explained that her odd eating behavior might be due to a deficiency, Kes asked if he was saying her body needed dirt. (VOY: "Elogium")
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