1) Green house gas 2) Gas is needed for burning 3) What is distillation? 4) A machine that consisting of many simple machine. 5) A giant wave usually caused by an underwater earthquake. 6) The layer that protects us from harmful UV rays. 7) Artificial satellite 8) What is pollution? 9) What is energy? Give examples. 10) Diseases caused drinking polluted water 11) Decomposers 12) A _____ of a star or planets in an object that goes around the star or planets. 13) A substance that used to purify water. 14) I am the eruption of magma out of the Earth 15) It tell us how closely the molecules are packed in a substance.

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