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rocks
rocks and rock layers
Term | Definition |
---|---|
igneous | a rock that is formed through melting cooling and hardening |
sedimentary | a rock that is formed through W-E-D-C-C |
metamorphic | a rock that is formed by heat and pressure |
rock layer's ages | a layer at the bottom is oldest and the one at the top is youngest |
W-E-D-C-C | weathering, erosion ,deposition ,compaction ,and cementation |
weathering | rocks are loosened and/or turned into sediment |
erosion | the sediment and/or tiny rocks are washed or blown away |
deposition | the sediment is placed down and stacked up |
compaction | the sediment is compacted together |
cementation | the sediment is glued together and turned into rock |