History, 24.03.2020 00:12 allytrujillo20oy0dib
Caves like this one can be found all around Pennsylvania. Most caves are formed in a soft rock called
Rain
runs through cracks in the rock and causes chemical erosion. The process takes thousands of years. Eventually it
carves out tunnels and caves below Earth's surface.
granite
B)
limestone
sandstone
D)
shale
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