Question

Sinkholes and karst topography are a clear indication that ________.

a. the groundwater is moving through cracks in the rock
b. the groundwater is moving through a limestone and forming caves that periodically collapse
c. the area has been subjected to past meteorite bombardments and groundwater is moving through the fractured rock
d. there is nothing unusual; these features occur everywhere
e. there is fast motion of groundwater in the subsurface

Answer 1

the groundwater is moving through a limestone and forming caves that periodically collapse

Step-by-step explanation:

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Answer 2

B. the groundwater is moving through a limestone and forming caves that periodically collapse

Step-by-step explanation: