science 8.2.1
Terms
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- index fossil
- a fossil known to have lived in a particular geologic age that can be used to date the rock layer in which it is found
- relative age
- a rock is its age compared too the ages of other rocks
- absolute age
- The age of a rock given as the number of years since the rock formed.
- rock
- a lump or mass of hard consolidated mineral matter
- intrusion
- the forcing of molten rock into fissures or between strata of an earlier rock formation
- law of superposition
- The geologic principle that states that in horizontal layers of sedimentary rock, each layer is older than the layer above it and younger than the layer below it.
- fault
- break in earths crust
- unconformity
- A surface that represents a break in the rock record, caused by erosion or lack of deposition
- extrusion
- lava that hardens on the surface
- inclusion
- a piece of rock that is contained in another rock