https://padlet.com/eileeng0731/48beuks10s9p How to determine the age of rocks and fossils? en-us 2017-07-10 23:34:20 UTC 2025-10-16 17:24:10 UTC hello@padlet.com eileeng0731 https://padlet.com/eileeng0731/48beuks10s9p/wish/178428663 Scientist use techniques such as relative dating and radiometric dating to calculate the age of fossils and rocks.
http://explorebuxton.co.uk/wp-content/uploads/2017/01/fossils-970x546.jpg]]> 2017-07-10 23:36:01 UTC https://padlet.com/eileeng0731/48beuks10s9p/wish/178428663 eileeng0731 https://padlet.com/eileeng0731/48beuks10s9p/wish/178428798 Fossils are found in sedimentary rocks within the layers. The process of reading the order is called stratigraphy. When scientists look at the rock layers, they are able to identify the age of the fossils.
https://media.quizizz.com/resource/gs/quizizz-media/questions/L2FwcGhvc3RpbmdfcHJvZC9ibG9icy9BRW5CMlVvU3Nkc3g3UXNuY3pZM3BWRFQwQnVGdEJ6NzF5RW1NQm15ZTBpNGh1TElEZEdXRTdiNUoySGFHV0M5WnFpclFZOG1sUUFOSTQyUWFiNDctWkRtbjVfOU01V2M4Zy5FdzNINVQ3TDUyMDNLc2hZ?w=500]]> 2017-07-10 23:38:38 UTC https://padlet.com/eileeng0731/48beuks10s9p/wish/178428798 eileeng0731 https://padlet.com/eileeng0731/48beuks10s9p/wish/178428871 Another way of calculating the age of fossils and rocks is radiometric dating. Radioactivity was discovered by a French physicist named Henri Becquerel.
http://www.nobelprize.org/nobel_prizes/physics/laureates/1903/becquerel.jpg]]> 2017-07-10 23:40:33 UTC https://padlet.com/eileeng0731/48beuks10s9p/wish/178428871 eileeng0731 https://padlet.com/eileeng0731/48beuks10s9p/wish/178429086 In 1907, they found that the lead ratio in uranium increased along with its geological age. Scientist discovered that the nuclear decay of radioactive elements is decaying at a steady rate. They were able to determine the age of rocks by calculating the decay of radioactive elements. ]]> 2017-07-10 23:46:02 UTC https://padlet.com/eileeng0731/48beuks10s9p/wish/178429086 eileeng0731 https://padlet.com/eileeng0731/48beuks10s9p/wish/178429119 Scientist also uses a process called correlation, which is using fossils to match rocks with the same age. Furthermore, index fossils help identify rocks. In order for a fossil to be an index fossil, it needs to live in a specific time period, can be easily identified, and found in many places.
https://static1.squarespace.com/static/51bbeba5e4b0510af19f26f7/t/52b8df14e4b0525234c38126/1387847445752/Rock+Correlation.jpg]]> 2017-07-10 23:46:54 UTC https://padlet.com/eileeng0731/48beuks10s9p/wish/178429119