| A | B |
|---|
| stable rock | a rock composed of minerals that resist weathering |
| weathering | the breaking down of rocks and other materials at the Earth's surface |
| crystal | a solid in which the atoms or molecules are arranged in a definite pattern that is repeated over and over again |
| clastic rock | a sedimentary rock formed from fragments of previously existing rocks |
| density | the amount of metter in a given space; the mass per unit volume |
| ore | a mineral or rock from which metals and nonmetals can be removed in usable amounts |
| organic rock | a sedimentary rock that is formed either directly or indirectly from material that was once alive |
| luster | the way a mineral reflects light from its surface |
| hardness | the ability of a minderal to resist being scratched |
| mineral | a naturally occurring, inorganic solid that has a definite chemical composition and crystal shape |
