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6th Grade
Rocks unit
| Question | Answer |
|---|---|
| Rock | a naturally occurring solid mixture of one or more minerals or organic matters |
| Rock cycle | the series of processes in which a rock forms, changes from one type to another, is destroyed, and forms again by geological processes |
| Erosion | sediment being transported/moved by wind, water, ice, or gravity |
| Weathering | process in which water, wind, ice, and heat break down rock |
| Deposition | the process in which sediment is laid down/dropped off |
| Composition | the chemical make up of the rock; what minerals are inside it |
| Texture | the quality of a rock that is based on the sizes, shapes, and position of the rock's grains |
| Igneous | forms when hot, liquid rock cools and solidifies |
| magma | hot, liquid rock below ground |
| lava | hot, liquid rock above ground |
| Extrusive igneous | forms from lava, on Earth's surface, fine grained |
| Fine grained | Extrusive igneous rocks' texture; smooth |
| Intrusive igneous | forms from magma under Earth's surface, coarse grained |
| Coarse-grained | Intrusive igneous rocks' texture; bumpy |
| Three ways magma forms | 1) PRESSURE is decreased. This allows the minerals to melt. 2) TEMPERATURE is increased. 3) COMPOSITION is changed. This may change the melting point of the rock, and it will melt. |
| Stratification | forming sedimentary rocks (weathering, erosion, deposition, lithification) |
| Lithification | compaction and cementation of rock layers/strata * Layers being squeezed together and then glued together* |
| 3 Types of sedimentary rock | Clastic, organic, and chemical |
| Sedimentary rock | contain strata, formed from sediment Formed through stratification |
| Metamorphic rock | formed through extreme heat and pressure |
| Metamorphism | rocks changing form |
| Deformation | rocks changing shape due to stress/bending |
| Foliated | metamorphic rock whose minerals are arranged in bands |
| Nonfoliated | metamorphic rock whose minerals are not arranged in bands |
| Examples of organic sedimentary rocks | Coal and coral |
| How are rocks MAINLY classified? | By how they form |
| What are two other ways rocks can be classified? | Texture and composition (minerals inside) |
| Which rocks can be weathered and eroded? | ALL |
| Clastic sedimentary rock | Sedimentary rock made up of rock fragments |
Created by:
Mrs. Corey