An active vocabulary is made up of the words readily used and clearly understood by an individual when speaking and writing. Contrast with passive vocabulary. Martin Manser notes that an active vocabulary consists of the words that [people] use frequently and confidently. If someone asks them to make up a sentence containing such and such a wordâand they can do itâthen that word is part of their active vocabulary..
Roofing slate is a dense, durable, naturally occurring material that is essentially nonabsorbent. Two properties of slate are cleavage and fracture. It has natural cleavage, which permits it to be easily split in one direction.Fracture, usually occurring at right angles to the cleavage, is called the grain. Roofing slate commonly is split so the length of the slate runs in the direction of the grain.The surface texture of slate after being split for commercial use derives from the characteristics of the rock from which it was quarried.oofing slate is a dense, durable, naturally occurring material that is essentially nonabsorbent. Two properties of slate are cleavage and fracture. It has natural cleavage, which permits it to be easily split in one direction.
Best Answer: Foliation is any penetrative planar fabric present in rocks. Foliation is common to rocks affected by regional metamorphic compression typical of orogenic belts. Rocks exhibiting foliation include the typical metamorphic rock sequence of slate, phyllite, schist and gneiss.The slatey cleavage typical of slate is due to the parallel growth of microscopic mica crystals.n gneiss the foliation is more typically represented by compositional banding due to segregation of mineral phases. Foliated rock is also known as S-tectonite in sheared rock masses. Formation Mechanisms Foliation is usually formed by the preferred orientation of minerals within a rock.