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science

AB
Sediments deposited in layers form _________ rocks.sedimentary
Gaps in rock layers are called _______.unconformitites
Some unconformities are the result of ________.erosion
Dinosaurs were alive on Earth for about ___ million years.160
When the isotope decays, a new _______ is formed.element
Calculating the absolute age of a rock is called ___________.absolute dating
States that Earth's processes occurring today are similar to those that occurred in the past.uniformitatianism
Fossil from a species that existed on Earth for a short period of time.index fossil
Fossil made from a thin film of carbon atoms and moleculescarbon film
Remain, imprint, or trace of a once-living organism.fossil
Hard and rocklike fossil.petrified remain
Cavity left in rock by a decayed organism.mold
Produced when a cavity is filled in with solid matter.cast
Organisms have a better chance of being preserved if they have _____ parts.hard
Scientists think that a _________ collided with earth and killed the dinosaurs.meteorite
Sometimes layers of rock are overturned by forces generated by ___________.tectonic activity
Determining the age of rocks examining their position in a layer is called __________.relative dating
The time it takes for half of the atoms in the isotope to decayhalf-life
States that the older rocks are at the bottom,and the younger at the top.law of superposition
When a species becomes _______ there are no longer any living members of its kind.extinct


monty

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