Loudoun County Public Schools / Overview
Rock Key – a classification system for identifying unknown rocks. Igneous Rock – a rock that is created after lava or magma (melted rock) cools and hardens. Sedimentary Rock – a rock that forms when sediments press together. Metamorphic Rock – a rock that has been changed by heat or pressure. Hardness – the test of how easily one rock will scratch (or be scratched) by another object. … ................
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