evolution
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16 terms
Terms | Definitions |
|---|---|
 fossils | the perserved trace, imprint, or remains of a plant or animal |
| petrification | the process of turning some plant material into stone by infiltration with water carrying mineral particles without changing the original shape |
| mold | shape or influence |
| tetrapod | A vertebrate possessing two pairs of limbs, such as amphibians, reptiles, birds, and mammals. |
| cast cast | a type of body fossil that forms when crystals fill a mold or sediments wash into a mold and harden into rock |
| imprints | shallow prints or marks in rocks |
| tarpit | Hollow in the ground in which natural tar accumulates by seepage.., Hollow in the ground in which natural tar accumulates by seepage |
| amber | a deep yellow color |
| lead | a soft heavy toxic malleable metallic element |
| trace fossil | a type of fossil that provides evidence of the activities of ancient organisms |
| evolved | to develop gradually by process of growth and change |
| uranium uranium | a white, radioactive metallic chemical element that weighs more than any other element in nature. |
| bipedal | having two feet |
| Radioactive dating | technique in which scientists calculate the age of a sample based on the amount of remaining radioactive isotopes it contains |
| geologic time scale | a chronological arrangement of geologic time subdivided into units |
| Paleontologist | a scientist who studies fossils to learn about organisms that lived long ago |
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