The Marble Caves are natural ... Limestones are some of the most soluble rocks in the world, he said, meaning they are extremely susceptible to erosion from water. The original limestone formed ...

When you combine the glossy surface of the marble with the light reflecting off the glacier silt in the water, you get a colorful ... are among the most soluble that exist,” Herve explained.

"The deposit on the Taj is water soluble. We are trying to ... poop itself may not degrade the white marble that covers the Taj Mahal, scrubbing the green-stained feces off the walls poses ...