Soil

Soil, also known as dirt or earth, was a mixture of organic and inorganic materials, air, and water located between a planet's lithosphere and atmosphere that supported life.

According to Sub-commander T'Pol, the soil and foliage on Terra Nova was going to remain irradiated for at least another decade as of 2151. 

Omicron Theta was a farming planet until 2338, when its soil bacteria were taken by the Crystalline Entity, making it useless. 

Paterson Supra planted radishes in a special type of soil for his science fair project in 2368. 

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. 

In 2370, Draylon II possessed, among other things, good soil, making it suitable for colonization by the Skrreea. 

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. 

Metaphorically, something said to be dirty was either unfair (dirty trick), disgusting (dirty joke) , or bad (dirty word/business) (, }})