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As streams flow through Stone Mountain, layers of sand build up. Over time, the sand particles form a sedimentary rock called sandstone.

What causes sandstone to change into metamorphic rock at Stone Mountain?

Sandstone is reshaped by erosion from a stream.
Sandstone builds up layers of sand at the mountain.
Sandstone experiences intense heat and pressure.
Sandstone has more sand particles compacted on top of it.