Sinkholes and karst topography are a clear indication that ________
A) the area has been subjected to past meteorite bombardments and groundwater is moving through the fractured rock
B) the groundwater is moving through cracks in the rock
C) the groundwater is moving through a limestone and forming caves that periodically collapse
D) there is nothing unusual; these features occur everywhere there is fast motion of groundwater in the subsurface
C
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