| A | B |
|---|
| cooling and hardening of magma deep underground results in these rocks | plutonic |
| example of a plutonic rock | granite |
| forms far from shoreline | silty shale |
| found in felsic rock | silica and oxygen |
| feature of sedimentary rocks | ripple marks |
| cooled and hardened deep underground | granite |
| forms at the surface | basalt |
| mafic | dark, thin, low silica content |
| two distinctly different textures | porphyry |
| fossils are found in these rocks | sedimentary |
| small crystal-lined spheres of silica | geodes |
| reacts to acid test | limestone |
| present is the key to the past | uniformitarianism |
| classified into intrusive and extrusive | igneous rocks |
| form from existing rocks | metamorphic |
| size of crystals depends on | time (rate of cooling) |
| made of pebbles | conglomerate |
| composed of silt | shale |
| last to settle out in the sorting process | silt |
| visible layering | stratification |
| contact metamorphism | occurs in small areas |
| regional metamorphism | occurs in large areas |
| pressure squeezes the materials into parallel layers | foliation |
| found at the bottom of the ocean | basalt |
| means conversion to rock | lithofication |
