5th Gr. Science Ch. 6-Lesson 3
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Created by:
HOLYINFANT on January 5, 2011
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6 terms
Terms | Definitions |
|---|---|
 relative age | the age of one rock or fossil as compared to another |
| absolute age | a rock's age in years |
| era | long stretches of time used to measure Earth's geological history |
| renewable resources | a resource that can be replanted or replaced naturally in a short period of time |
| nonrenewable resources | a resource that cannot be replaced within a short period of time or at all |
| alternative energy sources | a source of energy other than the burning of a fossil fuel |
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