While there are several differences between the two, the key difference between limestone and gravel is their compositions.

An curved arrow pointing right. Limestone is used in everything from cement and tiles to paper- and plastic-making. The Egyptians that mine the haunting white mountains risk their lives and limbs ...

Surface water and rain do not flow far on exposed limestone as they rapidly infiltrate into the rock and soil. Where a joint or intersection of joints has been greatly weathered or dissolved ...