Along with granite and limestone is another valuable natural resource that is often used as a building stone a. ore b. halite c. quartz d. marble need answers asa

amber has allowed scientists to study dna that has been preserved over millions of years.

hydrogen is a compound or a single element and a element is a pure substence that cannot be separated into simpler subtances

clorine is a compound its a chemical substance that forms when two or more different elements combine

so both hydrogen and clorine are compounds