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geologic time
earth
| Question | Answer |
|---|---|
| what is a fossil | is the remains, impression or other evidence preserved in rocks of the existence of former life. Fossils indicate that life evolved in a certain order and has changed and become more complex over geologic time. |
| half life | life is the length of time it takes for ½ (half) of the mass of a radioactive element (parent material) to change into a new stable (non-radioactive) element (daughter product). |
| relative dating | places orders in sequence without assigning an exact age. |
| superpostion | the oldest rock layers are on the bottom and the layers above are younger with the top layer being the youngest. Fossils contained in lower layers are older than fossils found in layers above them. |
| how can climate be changed? | by volcanism that place ash and smoke form forest fires that may cause short term effects blocking sunlight and reduction in temperature |
| what do relative dating and absolute dating do? | can be used to determine ages of rocks and structures |
| index fossils | are fossils of plants or animals that were abundant, widespread and were lived on this Earth a relatively short period of time (small range of age) before they went extinct |
| types of fossils | include molds (hollow impressions), cast (filled in molds that take the shape of the mold) and original bone or shell. |
| where are fossils found in virgina | found mainly in the Coastal Plain, Valley and Ridge and Appalachian Plateau. |
| why are fossils found in these areas on VA. | areas that contain sedimentary rocks. |
Created by:
DayjaMParrish
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