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acid allotropic alpha particle atomic mass units atomic number atomic weight best completes calories carbon dioxide carefully the following chemical change chloride combine complete statements 13 completes the second concept may help correctly completes created nor destroyed dew point earth eclipse electron shells equation following statements formula grams grams of water heat energy helium hydrocarbons igneous ionic compounds ions iron isotopes laccolith layers limewater lithification lithosphere ln the space magnesium mercuric oxide mercury metal metamorphic mineral molecules necessary to complete neutrons nitrogen nonmetal nuclear nuclear fusion nucleus number of electrons occurs ocean orbit outer shell oxide oxygen percent periodic table Place the letter planet pressure produced properties protons radioactive reactants read the complete rock second statement sedimentary Select the term solar space provided star Study carefully substance sulfur temperature term that best term that correctly term you choose thinking necessary volcanoes water vapor waves wind write the letter