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Study Science
dat stoof
Term | Definition |
---|---|
Fault | Makes rock layers shift up or down. |
Extrusion | A hardened layer of lava on the surface. |
Unconformity | The surface where new rock layers meet a much older rocksurface beneath them. |
Relative Age | The age of rock compared with other rocks. |
Law of Superposition | The way to determine relative ages of rocks. |
Intrusion | A hardened layer of magma under the earth's crust. |
Absolute age | The number of years since a rock has formed. |
Index fossil | Fossils that helps geologists match rocks. |