Learner's definition of DOMINANT. 1. [more dominant; most dominant] : more important, powerful, or successful than most or all others. The university has/plays a dominant [=major] role in the local economy. Money is the dominant [=main] force in consumer societies. The company is now dominant in its market.
Shale is a fine-grained sedimentary rock that can have high porosity, yet can be nearly impermeable due to the poorly interconnected voids.hale is a fine-grained sedimentary rock that can have high porosity, yet can be nearly impermeable due to the poorly interconnected voids.
Sedimentary rocks are formed from pre-existing rocks or pieces of once-living organisms. They form from deposits that accumulate on the Earth's surface. Sedimentary rocks often have distinctive layering or bedding. Many of the picturesque views of the desert southwest show mesas and arches made of layered sedimentary rock.Common Sedimentary Rocks: