Chapter 21 & 22
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15 terms
Terms | Definitions |
|---|---|
 Index Fossil | remains of plants or animals that were abundemt widley distritubeted and existed briefly that can be used by geologists to correlate or daterock |
| Prokaryote | single celled orgqansim that locks a nucleus is generally small belongs to kingdom to kingdom |
| eukaryote | organism that is compsed of cells that contain nuclei and generally larger and more complex than a prokaryote |
| orginal horizonatality | principle sating that sedmentary rocks are deposited in horizontal or nearly horizontal layers |
| era | 2nd largest time unit in the geologic time scale, measured in hundreds of millions of years and defined by diffrences in life forms that are preserved in rocks |
| epoch | time unit in geologic time scale smaller than peroid measured millions of years 10 of millions of years |
| eon | longest time unit in the goelogic time scale |
| super position | principle stating that in an undisturbed rock sequenc, the oldest rock layers are at the bottom and each successive layer is younger than beneath |
| amino acids | building blocks of proteins that were likely abudant on Earth during the Archean |
| evoulution | adaption of life forms |
| half life | peroid of time it takes for radioactiver isotopes such as carbon 14 to decay half of its orginal amount |
| peroid | 3rd largest time unit in the geological time scale measured in 10 in millions of years to hundreds of millions of years and defiend by which life forms were abundent |
| geologic time scale | record of Earth's history from its its orgin to its present used to correlate geologic events, enviomental changes and development of life forms that are preserved in rocks |
| dendrochronologly | science of comparing annul groeth in rings of trees to date events and enviomental changes |
| laurentia | ancient continet froemd during the proterzoic, modern day north america |
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