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The movement of the earth's crust may carry the rock as much as 700km (454 miles) below the surface. Here the temperature and pressure will be even higher and the rock will begin to melt. Molten rock is lighter than solid rock and it will begin to rise up through the overlying 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 rock solidifies underground and then all the rock above it must be eroded away before it can begin the cycle again.ROCK ISLAND, city, Illinois, seat of K«;,. Island County, at the junction of the Rock an: Mississippi rivers, at an altitude of 570 fee;. !: adjoins Moline and is opposite Davenport. Iwi 180 miles west of Chicago. Between Rock I-W and Davenport, but in the state of Illinoi-, iie-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 Rock Island took its rsne.
Fracture cleavage is the type of rock cleavage due to closely spaced fractures which are not necessarily parallel to the minerals of the rock. Slip cleavage is rock cleavage along which there has been displacement; this type resembles closely spaced faults. Some terms applied to rock cleavage imply origin. Flow cleavage is the result of rock flowage or plastic deformation. Much of slaty cleavage and schistosity are of this type.
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