When aluminum, al , metal is dipped in an aqueous solution of hydrochloric acid, hcl , hydrogen gas, h2 , is produced with the formation of an aluminum chloride, alcl3 , solution. Write the balanced chemical equation showing the phases of reactants and products

Earth's atmosphere is unique among the planets and is able to support life because it contains a large amount of a) oxygen b) helium c) methane d) carbon dioxide

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Afish fossil is found in a rock. a foot bone and tooth are found in an older layer of the same rock. what can scientists learn from the rock? a) the area changed from land to water. b) the area changed from water to land. c) the area has always been land. d) the area was once an ocean.