https://padlet.com/molliegaynor/nevbzrs2iqvb Mollie Gaynor en-us 2016-07-18 02:03:15 UTC 2026-01-24 03:44:23 UTC hello@padlet.com molliegaynor https://padlet.com/molliegaynor/nevbzrs2iqvb/wish/116529862  How do scientists know the age of rocks and fossils? ]]> 2016-07-18 02:04:08 UTC https://padlet.com/molliegaynor/nevbzrs2iqvb/wish/116529862 molliegaynor https://padlet.com/molliegaynor/nevbzrs2iqvb/wish/116529938 Fossils are found in sedimentary rocks, which is typically is layered from different periods of sediment accumulations (eras) making it so scientists can estimate the era that the fossils where left in]]> 2016-07-18 02:05:23 UTC https://padlet.com/molliegaynor/nevbzrs2iqvb/wish/116529938 molliegaynor https://padlet.com/molliegaynor/nevbzrs2iqvb/wish/116530305 Nuclear decay of radioactive elements are present in certain rocks (harden lava), that can be analyzed to determine the age of the specific fossil.]]> 2016-07-18 02:11:26 UTC https://padlet.com/molliegaynor/nevbzrs2iqvb/wish/116530305 molliegaynor https://padlet.com/molliegaynor/nevbzrs2iqvb/wish/116530462 By measuring the ages of volcanic layers in a stack of sedimentary rock, the entire order of the layers could be added to the absolute time scale meaning that fossils in certain layers are older than 73 million years, and those above are younger.]]> 2016-07-18 02:13:18 UTC https://padlet.com/molliegaynor/nevbzrs2iqvb/wish/116530462 molliegaynor https://padlet.com/molliegaynor/nevbzrs2iqvb/wish/116530727 2016-07-18 02:16:16 UTC https://padlet.com/molliegaynor/nevbzrs2iqvb/wish/116530727 molliegaynor https://padlet.com/molliegaynor/nevbzrs2iqvb/wish/116531198 2016-07-18 02:21:30 UTC https://padlet.com/molliegaynor/nevbzrs2iqvb/wish/116531198 molliegaynor https://padlet.com/molliegaynor/nevbzrs2iqvb/wish/116531252 http://www.learnnc.org/lp/editions/nchist-twoworlds/1671

http://biologos.org/questions/fossil-record

http://naturalhistory.si.edu/exhibits/backyard-dinosaurs/questions-answers.cfm?know=a24

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