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sci7 Fossil Record
| Term | Definition |
|---|---|
| fossil | the preserved remains of a once living organism |
| petrification | the conversion of organic material into rock |
| resin | a thick, slowly flowing liquid produced by plants that can harden into a solid |
| extinct | a term applied to a species that was once living but now is not |
| When a plant or animal dies, what is the most likely thing that will happen to it's remains? | decompose |
| Which forms first: a fossil mold or fossil cast? | mold |
| What is required in order for petrifaction to occur? | water with lots of minerals |
| Can you learn much about the thickness of an organism from carbonized remains? | no, because it is flattened |
| What type of organism is most likely to leave carbonized remains? | Plants because tissue is ideal for carbinization process so more likely to be preserved in this way |
| What is so nice about fossils that have been encased in amber or ice? | they are well preserved because they decompose quicker |
| What are the four general features of the fossil record? | fossils are usually found in sed, rock, 2) the majority of the fossil record is made up of hard shelled creatures 3)fossils may be org. that are now living or extinct, 4)fossils found in 1 layer of strat. rock can be different from those found in another |
| What kinds of creatures make up the vast majority of the fossil record? | stuff with bones or hard shells |
| Approximately how many species of plants and animals have gone extinct in the last 400 yrs: a 100, a 1,000, 10,000 or a hundred thousand? | 1000 |
| What is a trilobite? Are tribobites extinct? | it is a hard shelled sea creature, and yes, they are extinct |
| What is a placoderm? Are they extinct? | little fish that are probably extinct |
| What is the uniformitarian explanation for how most sedimentary rocks formed? | the lower it is the older it is, formed slowly over time |
| What is the catastrophist explanation for how most sedimentary rocks formed? | some layer were effected by the worldwide flood and earthquakes |
| What is the uniformitarian explanation for why different fossils are found in different strata? | they think that the lower they are the older they are, and they lived during that time |
| What is the catastrophist explanation for why different fossils are found in different strata? | an indication that the flood trapped the creatures in different places in different stages of the flood |
| What major speculation must uniformitarians make when studying geology? | that earth is at least a few million years old, the present is key to past, stuff still happens in a similiar way |
| What major speculation must catastrophists make when studying geology? | that the flood happened |
| Why does petrifaction usually produce fossils with more info than fossil casts? | petrification saves bit of creature, but a fossil cast is just the shape, doesn't contain organic matterial |
| Describe the process of a cast forming, indicating when the mold has formed and when the cast formed. | dead matter is surrounded by sediment which becomes rock, decays, forms hollow mold, mold can be filled with sed. or magma, which hardens and forms a cast |
Created by:
elithewall