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Erosion by Groundwater | CK-12 Foundation Skip Navigation  What
resources does a coastal city need?  Tulum is a walled city that
was once inhabited by the Maya people. Tulum is on the Yucatan
Peninsula of Mexico. The beautiful blue Caribbean supplied the
Maya with abundant fish. What else would the Maya people have
needed? Fresh water is found in cenotes, sinkholes that are
common in the Yucatan limestone.  Groundwater Erosion  Some
water soaks into the ground. It travels down through tiny holes
in soil. It seeps through cracks in rock. The water moves
slowly, pulled deeper and deeper by gravity. Water in an
underground rock or sediment layer is groundwater . Underground
water can also erode and deposit material.  Rainwater absorbs
carbon dioxide (CO 2 ) as it falls. The CO 2 combines with water
to form carbonic acid. The slightly acidic water is especially
good at dissolving the rock limestone. Groundwater creates
landforms by dissolving away rock.