quick-write what is a fossil?. fossils fossils are remains, or evidence, of living organisms that...
TRANSCRIPT
![Page 1: Quick-write What is a fossil?. Fossils Fossils are remains, or evidence, of living organisms that have been preserved over millions of years](https://reader036.vdocument.in/reader036/viewer/2022062314/56649dc85503460f94abd6fc/html5/thumbnails/1.jpg)
Quick-write
• What is a fossil?
![Page 2: Quick-write What is a fossil?. Fossils Fossils are remains, or evidence, of living organisms that have been preserved over millions of years](https://reader036.vdocument.in/reader036/viewer/2022062314/56649dc85503460f94abd6fc/html5/thumbnails/2.jpg)
Fossils
• Fossils are remains, or evidence, of living organisms that have been preserved over millions of years.
![Page 3: Quick-write What is a fossil?. Fossils Fossils are remains, or evidence, of living organisms that have been preserved over millions of years](https://reader036.vdocument.in/reader036/viewer/2022062314/56649dc85503460f94abd6fc/html5/thumbnails/3.jpg)
Rock fossils
• Remains of living organisms that have been turned into rock.
• The hard parts of the organism like shells and bones get buried in sediment.
• Found in layers of sedimentary rock.
![Page 4: Quick-write What is a fossil?. Fossils Fossils are remains, or evidence, of living organisms that have been preserved over millions of years](https://reader036.vdocument.in/reader036/viewer/2022062314/56649dc85503460f94abd6fc/html5/thumbnails/4.jpg)
Molds and Casts
![Page 5: Quick-write What is a fossil?. Fossils Fossils are remains, or evidence, of living organisms that have been preserved over millions of years](https://reader036.vdocument.in/reader036/viewer/2022062314/56649dc85503460f94abd6fc/html5/thumbnails/5.jpg)
Petrified wood
![Page 6: Quick-write What is a fossil?. Fossils Fossils are remains, or evidence, of living organisms that have been preserved over millions of years](https://reader036.vdocument.in/reader036/viewer/2022062314/56649dc85503460f94abd6fc/html5/thumbnails/6.jpg)
Trace fossils
• Evidence the organism existed is preserved in rock.
• Examples include: footprints, animal homes or even feces.
![Page 7: Quick-write What is a fossil?. Fossils Fossils are remains, or evidence, of living organisms that have been preserved over millions of years](https://reader036.vdocument.in/reader036/viewer/2022062314/56649dc85503460f94abd6fc/html5/thumbnails/7.jpg)
Carbon films
• Every living thing contains carbon. Sometimes when an organism dies the carbon is left behind on a rock in a visible layer.
![Page 8: Quick-write What is a fossil?. Fossils Fossils are remains, or evidence, of living organisms that have been preserved over millions of years](https://reader036.vdocument.in/reader036/viewer/2022062314/56649dc85503460f94abd6fc/html5/thumbnails/8.jpg)
Original remains
• These are fossils that are actual bodies or parts of bodies of the organism. They are preserved by being sealed inside of a substance that keeps the organisms from decaying.
Amber (resin or tree sap)Ice (freezes the dead organism)Tar (sticky, oily substance)
![Page 9: Quick-write What is a fossil?. Fossils Fossils are remains, or evidence, of living organisms that have been preserved over millions of years](https://reader036.vdocument.in/reader036/viewer/2022062314/56649dc85503460f94abd6fc/html5/thumbnails/9.jpg)
![Page 10: Quick-write What is a fossil?. Fossils Fossils are remains, or evidence, of living organisms that have been preserved over millions of years](https://reader036.vdocument.in/reader036/viewer/2022062314/56649dc85503460f94abd6fc/html5/thumbnails/10.jpg)
Index Fossils
• Some fossils can be used as index fossils to provide information about the age of rock layers. Not all fossils are index fossils.
• An index fossil must have lived:1. For a relatively short period of time2. In many places around the world
![Page 11: Quick-write What is a fossil?. Fossils Fossils are remains, or evidence, of living organisms that have been preserved over millions of years](https://reader036.vdocument.in/reader036/viewer/2022062314/56649dc85503460f94abd6fc/html5/thumbnails/11.jpg)
Index Fossils
• For example: Viviparus is a common river snail that has only been around since the late Jurassic period. Rocks containing fossils of Viviparus are younger than the late Jurassic period.
![Page 12: Quick-write What is a fossil?. Fossils Fossils are remains, or evidence, of living organisms that have been preserved over millions of years](https://reader036.vdocument.in/reader036/viewer/2022062314/56649dc85503460f94abd6fc/html5/thumbnails/12.jpg)
Relative Age
• Relative age is the age of an event or object in relation to other events or objects.
• For example I have a younger brother, so you know he is less than 42 but you don’t know his exact age.
• If a scientist finds a new kind of fossil in the same rock as a Viviparus fossil he can determine the relative age of the new fossil.
![Page 13: Quick-write What is a fossil?. Fossils Fossils are remains, or evidence, of living organisms that have been preserved over millions of years](https://reader036.vdocument.in/reader036/viewer/2022062314/56649dc85503460f94abd6fc/html5/thumbnails/13.jpg)
Rock layers and relative age
![Page 14: Quick-write What is a fossil?. Fossils Fossils are remains, or evidence, of living organisms that have been preserved over millions of years](https://reader036.vdocument.in/reader036/viewer/2022062314/56649dc85503460f94abd6fc/html5/thumbnails/14.jpg)
Absolute Age
• To know my brothers absolute age you would have to know is birthday.
• Scientists can find out the absolute age of rocks and fossils they use a technique called radioactive dating.• Uranium 235 can be used to date igneous rocks• Carbon 14 is used to date anything that was living.
![Page 15: Quick-write What is a fossil?. Fossils Fossils are remains, or evidence, of living organisms that have been preserved over millions of years](https://reader036.vdocument.in/reader036/viewer/2022062314/56649dc85503460f94abd6fc/html5/thumbnails/15.jpg)
Radioactive Dating
• When a rock or living organism is formed some of its elements are unstable.
• Depending upon the element, over a period of time the element undergoes radio active decay at a constant rate.
• This decay can be measured in “half-life” which is the time it takes for half of the element to decay.
![Page 16: Quick-write What is a fossil?. Fossils Fossils are remains, or evidence, of living organisms that have been preserved over millions of years](https://reader036.vdocument.in/reader036/viewer/2022062314/56649dc85503460f94abd6fc/html5/thumbnails/16.jpg)
Carbon 14 Decay