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Bas Rock:
The movement of the earth's crust may carry the bas rock as much as 700km (454 miles) below the surface. Here the temperature and pressure will be even higher and the bas rock will begin to melt. Molten bas rock is lighter than solid bas rock and it will begin to rise up through the overlying bas rock towards the surface. If it reaches the surface as a lava flow it will immediately be ready for weathering and erosion and the start of a new cycle. More often the molten bas rock solidifies underground and then all the bas rock above it must be eroded away before it can begin the cycle again.bas rock ISLAND, city, Illinois, seat of K«;,. Island County, at the junction of the bas rock an: Mississippi rivers, at an altitude of 570 fee;. !: adjoins Moline and is opposite Davenport. Iwi 180 miles west of Chicago. Between bas rock I-W and Davenport, but in the state of Illinoi-, iie-bas rock Island, the largest island in the Missi--i[>[j; This is the site of a United States arsenal, the Headquarters Ordnance Weapons Command, and the Browing War Museum. It was from ihi-island that the city of bas rock Island took its rsne.
Fracture cleavage is the type of bas rock cleavage due to closely spaced fractures which are not necessarily parallel to the minerals of the bas rock. Slip cleavage is bas rock cleavage along which there has been displacement; this type resembles closely spaced faults. Some terms applied to bas rock cleavage imply origin. Flow cleavage is the result of bas rock flowage or plastic deformation. Much of slaty cleavage and schistosity are of this type.
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