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Relative Dating
Term | Definition |
---|---|
fault | a break in Earth's crust |
extrusion | a hardened layer of lava on Earth's surface |
unconformity | the surface where new rock layers meet a much older rock surface beneath them |
relative age | the age of rocks compared with the age of other rocks |
law of superposition | the way to determine relative ages of rock |
instrusion | a hardened layer of magma beneath Earth's surface |
absolute age | the number of years since a rock has formed |
index fossil | fossils used to help geologists match rock layers |