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19 Cards in this Set
- Front
- Back
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trace fossil |
is the preserved evidence of the activity of an organism |
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relative age |
is the age of rocks and features compared with other rocks and features near by |
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half life |
is the time required for half of the parent isotope to decay into daughter isotopes |
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catastrophism |
is the idea that conditions and organisms on earth change in quick violent events |
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correlation |
is the matching rock and fossils from separate locatioms |
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superposition |
is the principle that in undisturbed rock layers, the oldest rocks are on the bottom |
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uniformitarianism |
states that processes that occur today are similar to those that have occurred in the past |
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what parts of an organism are most likely to make fossils |
the hard parts |
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what types of things are easily dated using carbon-14 |
once living things, not rocks |
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would an isotope with a long or short half life be most useful for dating very old rocks |
long half-life |
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how are fossil molds and fossil casts different? |
mold are an impression of an organism left in a rock.Casts are copies of organisms made when molds are filled with sediment,which gardens into a fossil cast |
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what are three characteristic last of an index fossil? |
a species that LIVED FOR A SHORT time in MANY LOCATIONS and was ABUNDANT |
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is rock C or B older |
rock C is older because it is and inclusion and therefore older than the rock containing it |
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a rock layer at earths surface contains many fish fossils. Describe how the fossils may have formed and explain how this part of Earth has changed over time. |
The fish does and have buried by sediment. Which preserves the bones as a mold. This area changed over time because it was once under water and became exposed. Possibly through uplift or when the water went back |
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whicl layer is older A or B |
layer A |
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Rock A is igneous rock. The thin black bed above it is a sedimentary rock. what type of unconformity exists ar point D |
nonconformity |
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Feature g is a fault. Did the fault occur before or after rock layer f was deposited |
after |
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what two geoligic principles could you use to determine whether the rock beds on either side of a river valley are the same |
inclusion and correlation |
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