Vocabulary - Rocks and Minerals HOMEWORK for 11/16-20/09 - same as usual vocabulary. Folders are due on Wednesday. There will be a test on Friday. It will be matching rather than fill-in-the-blank this week. 1. cleavage: the tendency of a mineral to split easily along flat surfaces 2. hardness: a measure of how easily a mineral can be scratched 3. streak: the color of a mineral whien it is ground to a powder 4. rock: a solid material made up on one or more minerals 5. rock cycle: a continuous series of changes that racks undergo 6. mineral: a nonliving solid material that has a definite chemical makeup 7. luster: the way a mineral shines, or reflects light 8. igneous: the type of rocks that form when melted rock from deep below Earth's surface cools and hardens 9. metamorphic: the type of rocks that form when exicting rocks are changed by extreme heat and pressure 10. sedimentary: they type of rocks that form when sand, particles of rock, bits of soil, and the remains of once-living things are pressed together and harden