| A | B |
|---|
| igneous | made from lava or magma |
| sedimentary | rock pieces cemented together |
| metamorphic | changed by heat and pressure |
| mineral | a natural, inorganic, solid with a definite crystal shape or compostion |
| rock | a solid; made up of minerals |
| rock cycle | explains how the rocks are formed |
| luster | how the minerals shine |
| streak | a powder left from a mineral on a ceramic plate |
| cleavage | the ability of a mineral to break into flat planes |
| fracture | the tendency of an object to break irregulary |
| inorganic | made from nonliving things |
| crystal | the atomic structure of a mineral |
| intrusive | igneous rocks formed inside the Earth |
| extrusive | igneous rocks formed outside the Earth |
| clastic | rocks made up of other rock pieces |
| chemical | rocks that are made from evaporation or precipation |
| organic | made from living things |
| foliated | made up of layers or "bands" of color |
| fossil | preserved remains of a once living organism |
| vein | narrow slab or channel of a mineral difference from the surrounding rock |
| law of superposition | states that sedimentary rocks form one layer on top of the next; so older rocks are underneath younger rocks |
| relative age | how old rock is compared to other rocks |
| index fossils | fossils of widely distributed organisms that live only for a short period of time |
