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Natural Rock Have One:
(1) natural rock have one soil. Most natural rock have one soils make a poor road surface. They are dusty when dry and muddy when wet.
(2) natural rock have one gravel. This is found in stream beds or where streams or glaciers have deposited it in past ages. Gravel contains var>ing amounts of sand and rounded rock particles. Deposits other than those in streams generally contain some clay.
(3) Rock. For road building rock should be hard and tough rather than soft and brittle. It is almost always crushed for road use, but in a few countries expert workmen cut stone into paving blocks.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.
Gems that are of inorganic origin and occur as natural rock have one minerals are formed in several different ways. Many gems are found in igneous rock, that is, rock formed directly from magma that has welled up from the earth's interior and solidified beneath the surface. As magma cools, the elements tend to separate into regions where they form different minerals.
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