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.
Cleavage and Fracture. Click here to go back to the main page. Cleavage is the tendency of a mineral to break along smooth planes parallel to zones of weak bonding.Fracture is the tendency of a mineral to break along curved surfaces without a definite shape. These minerals do not have planes of weakness and break irregularly.See the picture below:leavage and Fracture. Click here to go back to the main page. Cleavage is the tendency of a mineral to break along smooth planes parallel to zones of weak bonding.