How is coal usually used

How is the composition of a meteorite relevant to finding out the composition of earth's core?

Mary is conducting an experiment on how pollution affects plant growth. how can she ensure that her data are reliable?

Mercury turns to vapor at 629.88 k how much heat is lost 175 g of mercury vapor at 650 current condenses to a liquid at 297 ca mercury turns to weber at 629.88 kelvin how much he is lost 175 g of mercury vapor and 650 coming condensers to liquidate 297 kevin