When they're trying to solve a problem, engineers follow a series of Question 1 options: problems steps solutions tests

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)

i would say b

explanation:

but i think i would need more information than that