EARTH Crossword Puzzle
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QUESTIONS LIST: mineral : a naturally occurring, pure chemical substance, ore : minerals deemed valuable, luster : how light reflects off the surface of a mineral, granite : a type of intrusive igneous rock, obsidian : a type of extrusive igneous rock, sedimentary : a type of rock when sediments are compacted, metamorphic : a type of rock when igneous rocks are under heat and pressure, igneous : a type of rock when magma is melted, compaction : the squeezing of sediment by the weight of overlying layers, berosion : the transport of sediments by wind or flowing water.