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Fossils
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Fossils : are persevere remains or traces of living things
Trace Fossils : provide evidence of the activities of ancient organisms
Carbon Film : an extremely thin layer of coating on a rock
Relative Age : a rock is its age compared to the ages of other rocks
Absolute Age : a rock is the number of years that have passed since the rock form
Index Fossil : a fossil must be widely distributed and represent an organism that existed for a geologically short period of time.
Halflife : of a radioactive element is the time it takes for half of the radioactive atoms to decay
Eras : Geologist divide the time between Precambrian Time and the present into three long units of time
Fossils
1. | of a radioactive element is the time it takes for half of the radioactive atoms to decay |
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2. | an extremely thin layer of coating on a rock |
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3. | a rock is its age compared to the ages of other rocks |
| |
4. | are persevere remains or traces of living things |
| |
5. | Geologist divide the time between Precambrian Time and the present into three long units of time |
| |
6. | a rock is the number of years that have passed since the rock form |
| |
7. | provide evidence of the activities of ancient organisms |
| |
8. | a fossil must be widely distributed and represent an organism that existed for a geologically short period of time. |
| |
© 2013
PuzzleFast.com, Noncommercial Use Only
Fossils
1. | of a radioactive element is the time it takes for half of the radioactive atoms to decay |
| |
2. | an extremely thin layer of coating on a rock |
| |
3. | a rock is its age compared to the ages of other rocks |
| |
4. | are persevere remains or traces of living things |
| |
5. | Geologist divide the time between Precambrian Time and the present into three long units of time |
| |
6. | a rock is the number of years that have passed since the rock form |
| |
7. | provide evidence of the activities of ancient organisms |
| |
8. | a fossil must be widely distributed and represent an organism that existed for a geologically short period of time. |
| |
© 2013
PuzzleFast.com, Noncommercial Use Only