| A | B |
|---|
| Mineral | naturally occurring, inorganic, definite chemical composition |
| Cleavage | mineral breaks, predictable pattern |
| Fracture | mineral breaks in random pattern |
| Hardness | mineral's resistance to being scratched |
| Moh's Scale | classifies minerals on hardness |
| Luster | metallic or non-metallic, reflection of light |
| streak | color of the powered form of mineral |
| monomineralic | rock made from one mineral |
| Cross section | side view of geologic feature |
| relative dating | method od dating rock, ex: bottom is "older", top is "newer" |
| Absolute dating (radioactive dating) | dating rockes to an exact age |
| index fossil | fossil of organism that lived in a widespread area and for a short time |
| half-life | time it takes for half of a radioactive material to become stable |
| stable | same electrons and protons, no change or decay |
| principle of superposition | bottom is older, top is "newer"/younger |
| principle of uniformitarianism | what happened now must have happened in teh past |
| unconformity | buried erosional surface btwn 2 different rock layers |
| orginal horizontality | sedimentary rocks are layered horizontally when they were deposited |
| outgassing | volcanoes emit gasses such as carbon dioxide and water vapor |
| outcrop | several exposed layers of rock that is visible to humans |
