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| Traces or remains of once living organisms |
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1.Usually must have hard parts such as bones,teeth,shells,stem,tree trunks.
2.Must be protected from air and microorganisms.
3.Form in sedimentary rock. |
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| fossils that are the actual bodies or body parts of organisms. |
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| one of the best preservers that preserves prehistoric remains, such a s bones,muscles,skin, ande even hair. |
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| a natural sticky substance that preserves the remains of insects and ohter small organisms, resin.{ can harden} |
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| a visible shape tha was left after an animal or plant was buried in seidement and then decayed away, then later becomes filled with minerals. |
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| the stone fossil of a tree |
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| when a dead plant or animal decays, its carbon is left behind as a visible layer. |
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| evidence of an animals presence in a given location such as footprints, traits,animal holes, and even feces. |
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can develop an accurate history of overall weather patterns overtime.
1] thick rings{ lots of rainfall
2] thin rings{dry years,period} |
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a tubalar sample that shows the layers of snow and ice that have built over thousand of years.
- help understand how Earht's climate is changing and how it can change to the future. |
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| is the age of an event in object in relation to other events or objects. |
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| states tha in horizontal layers of undisturberbed sedimentary rock, the oldest rock layers are on the bottom and the youngest are on the top. |
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| when magam pushes its way through the rock layers and hardens into igneous rock, always younger than the rock surrounding it. |
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| a gap in rock layerr, oftem cause by erosion. |
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tell the relative ages of rock layers in which they are found.
1] only lives for certain period
2]were abudunt
3]were widespread |
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| is the actual number of years since the rock formed or the evetn occures{used on igneous rock} |
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is the process of measuring the rate of change of a raioactive
- such as carbon -14 & uranium 235 into its daughter elements. |
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| is the time it takes for half of the atoms of radioactive sample to decay{ change from unstable to another form} |
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A] earth is always-changing place
B] the same forces of change at work today were at work in the past{ mountain-building,erosion.etc} |
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| divides the history of the earth inot sections of time based upon major biologic and geologic changes. |
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| Eons-thelargest unit of time is broken into eras,eras into periods,periods into epochs} |
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| one of the several periods in Earth's history when large numbers of spiecies becames extinct at nearly the same time. |
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| the process through which species change over time; can refer to the changes in a particular population or to the formation and extinction of spiecies over the course of Earth's history. |
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| the process through which apiecies thgat are best suited to their enviroment survive and reproduce at a higher rate than other members of the spiecies. |
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| the evoulution of a new species from an exsisting species. |
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