How does the granite of a mountain change first into a sandstone into a quartzite?

How does the granite of a mountain change first into a sandstone into a quartzite?
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The minerals that make up the granite in the mountain areweathered by chemicals at the surface of the Earth and they allbreak down except the quartz which is stable at the Earth'ssurface.Water, ice and wind transport the quartz and deposit it in wateras a sandy sediment.As this sediment is buried by more arriving on top, it stickstogether over time to form a new hard rock called a sandstone.If the sandstone is buried deeper it heats up and the grains arewelded together to form a metamorphic rock called a quartzite.
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