Uniformitarianism is the idea that

Uniformitarianism is the idea that the natural processes operating today are the same as the natural processes that operated in the past

in theory, limestone is composed principally of the compound calcium carbonate - caco3, but in reality this compound is deposited in conditions involving a number of other compounds as impurities so it ends up being a mixture of many compounds.

hope this : -)

tony (lordcaos066)

for points guys