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Fossils
Earth Science
Question | Answer |
---|---|
Petrification | Where minerals and water seep into bones of decayed animals and turn the bones to stone after evaporation |
Half life | the amount of time it takes a radioactive element to have half decay into a non radioactive element |
Nonconformity | forms between non sedimentary and sedimentary rocks |
Radioactive dating | the amount of time it takes a radioactive element to have half decay into a non radioactive element |
Intrusion of magma | has to have formed after the rock layers were present, therefore the intrusion is younger |
Extrusion of magma | is when magma is forced to the top of the rock layers, layers were there first, therefore the extrusion is younger |
Fault | a crack in the rock where one side can move |
Rate of deposition | Can use the average amount of deposition, about 30mm a year to date fossils and rock layers |