1) Earth has a ........ a) house b) mountain c) crust d) volcano 2) Earth's crust moves very, very .... a) slowly b) fast c) big d) up 3) Earth's crust can ....... and make mountains. a) move down b) get big c) move up d) get small 4) Some ........ are millions of years old.  a) volcanos b) trees c) crusts d) mountains 5) Volcanos are ........ in Earth's crust. a) mountains b) rocks c) holes d) old 6) ....... come out of volcanos. a) crust b) hot rocks c) mountains d) water 7) Volcanos can be ....... a) small b) big c) good d) dangerous

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