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Ch.3, Sec.2 Rock Age
Relative Ages of Rocks
| Question | Answer |
|---|---|
| relative age | age of something compared to other things |
| principle of superposition | states that rock layers on the bottom is oldest while the rock layer on top is youngest |
| intrusion | when igneous rock or magma moves in to other rock layers and cools |
| extrusion | when igneous or lava moves onto surface rock and cools |