| A | B |
|---|
| Volcanic neck | intrusive structure formed from magma solidified within the throat of a volcano |
| Uniforitarianism | Present processes that shape Earth today operated throughout most of Earth's history |
| MOHO | Boundary between the crust and the mantle |
| Mantle | Ultramafic composition and largest of Earth's divisions |
| Lithosphere | uppermost part of the mantle that is relatively rigid. |
| Asthenosphere | Part of upper mantle that is soft and flowing |
| Plate Tectonics | regards the lithosphere as borken into plates that are in motion |
| Aulacogen | Failed rift caused by divergent plates filled with sediment |
| Intrusive Igneous Rocks | Magma cools slowly, with course grained crystals |
| Basaltic | Mafic or igneous rocks |
| accretionary wedge | thrust faulted and folded marine sediment |
| Oxygen | the most abundant element in earth's crust |
| Crystalline | Substance which the atoms are arranged in a three dimensional, regularly repeating, orderly pattern |
| Feldspars | most common minerals in earth's crust containing at least, silicon, aluminum and oxygen |
| Hardness | tested by Moh's scale |
| Streak | Color of a mineral in powdered form |
| Luster | The way light reflects from mineral's surface |
| Crystal Form | Results when a mineral forms with lots of time and space |
| Cleavage | The tendency of amineral to break along planes of weak bonding |
| Extrusive Igneous Rocks | Magma cools quickly resulting in fine grained crystals |
| Paleomagnetism | Remnent magnetism in rocks recofding direction of Earths magnetic field |
| Viscosity | Resistance to flow influencing how easily gas escapes |
| Igneous rocks | Classified by texture and chemical composition |
| Mineral | A naturally occuring, inorganic crystalline solid with definite chemical composition |
| Rock | Naturally formed, consolidated material composed of grains of mineral(s) |
| Felsic | Granitic composition rich in non-ferromagnesium minerals |
| Polymorphic Minerals | Have same composition but unique crystalline structure |
| Texture | Determined by environment which rock has solidified |
