| Question | Answer |
|---|---|
| composition of igneous rocks | felsic and mafic |
| feLSic | composition of igneous rock-lighter color, lower density, rich in Silicon and aLuminum |
| MafIc | composition of igneous rock-darker color, higher density, rich in Iron and Magnesium |
| Basalt | formation=extrusive, texture=fine, color=darker, composition?? |
| granite | formation=intrusive, texture=coarse, color= lighter, composition ?? |
| sedimentary rocks are formed by | by the deposition of weathered rocks, deposition of biological activity, precipitation from solution |
| deposition of biological activity | shells and fossils |
| compaction | sedimentary rocks-squeezes |
| erosion | sedimentary rocks-movement |
| uplift | sedimentary rocks-raised |
| cementation | sedimentary rocks-natural gas |
| weathering | sedimentary rocks-broken down |
| deposition | sedimentary rocks-drops |
| classification of sedimentary rocks | clastic, chemical, organic |
| clastic | sedimentary rocks-composed of weathered bits of rocks and minerals, classified by particle size |
| how are clastic rocks classified | by particle size |
| chemical | sedimentary rocks-forms when dissolved minerals precipitate from water solutions, water usually evaporates or boils, ex limestone, and rock salt |
| example of sedimentary rocks formed by chemicals | limestone, rock salt |
| 5 key words related to sedimentary rocks | compaction, erosion, uplift, cementation, weathering, deposition |
| features of sedimentary rocks | super positioning, ripple marks, fossils, mud cracks |
| super positioning | in undisturbed rocks, the oldest layers are found on the bottom and the youngest at the top, |
| ripple marks | rock formed along the beach or stream bed |
| fossils | braces of remains of ancient life |
| mud cracks | formed when wet mud of clay dried and shrank leaving a rock record of a dry environment |
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