alright today we will talk about the fossil record the last chapter in this unit I gather we will finish this week which mean test next week and prob no more tests after and then we will be done with the standards meaning i have taught you everything i am supposed to teach you and that means i get to teach you whatever i want so the rest of the week i will focus on fossil i read the intro and its lame so we are going to talk about how fossils form etc starting off on how fossils form who would like to read first lets go with Logan
*Logan reads*
to which then over time sediments sorta get carried over the river and get deposited over the dead organisms and it will just get taller and higher and so on with the remains buried in a rock and we will see the sediments on the top start to get weathered away letting scientist discover these thing question obe same way sediments that pile up slightly different but that like the classic way so were going to read a little bit about fossils typically
so in a petrified fossil the remains them-self have turned into rock so over time the minerals begin to replace remains so we learned about sedimentary rocks a couple sections ago do you remember what that was called its how salt is formed what is participated out that a word we did use it is a chemical sedimentary rock so it is formed by the use of chemicals and water my dear children is a chemical so here are some examples we got a starfish a snake in essence of petrified fossil it just used to be a dead thing in there to witch point we are only left with rock
*typing*
*silence*
*life thoughts*
*giggling*
so the next type we got is Called a molds and casts who would like to go next talon
*talon reads*
you get like the molds the plastic thing it gets the shape of the thing you got the little things with shapes you put the sand in it so after you take it out that is known as the fast so here we got the trilobite with used to crawler around on the floor been dissolved or decayed or just weathered away forming a new sedimentary rock forming what it might have looked like so hears another one of a seashell which shows the thing looking like the thing so here yeas and years of molds and CST whats the mold is the hollow part and the cast is the copy the mold is the plastic and the cast its the play-dough correct answer mold not the stuff that grows in the fridge
*Colleen: oh my goshhhhhh*
*Ellie noises*
*more Ellie noises*
*typing*
*colleen gets mad at Nevaeh for typing the notes*
*Nevaeh talks really loud*
*Nevaeh misspelled “shut up”*
finally the rarest of all the fossils prob shouldn't even be categorized as a fossil lets go Casey
*Casey reads*
well so like Casey said sometimes fossil can be preserved in other thing for example ice so even in some cases the organic material will still remained and we can study the DNA so the rarest but the most special. so here’s is spider preserved in remains kinda like those lollipops at the gas station like the organism as is but its kinda cool and then we got the mammoth which have been discovered in ice so scientists are even in the process of cloning a mammoth
*fights with random adult sitting in class for some reason*
and then Jurassic park so preserved remains are by eefeintihon remains that have staye intacetyed
how often are those found
there very rare fossils themselves are rared but this are reallllllllly rare
*Ellie makes more noises*
*Ellie makes MORE noises*
so studoignsfoosifdsalbkhnvj so were trying to create a picture of all of earths life though history risk worth klbawetuqgi4knz so any time we do discover a fossil of an organism question talon? so... so if we find a new fossil and we are trying to fit in into a time lines ifhuakrjhsgkfdurkljth,mfiog.,;r 1 pretty good and 1 not good determaining a fossild’s welll right about than more tommorow leats learn about a foisssls age cason read
*cason reads*
earlire than th eother one wer can do this alothof other ways such as relative dating who would like to read that thank you grason
*grayson reads*
were only able to figured out how oldo it is if we ccompare we cant do that wiht relative dating this is based entirely off this is found aexpoose awthe layetrs of rocke we can see if we find a fossil closer to the top that fossil is probably younger but the deeper we go the older it shoudl be if we found of foiasflkasdfdfoaiefklv laef f ghtat gave rise to the next one so here we eddesmtone that
*Ellie makes weird face*
*johnosn drinks*
*Ms.Johnson look sad, mad, confused, and gives rose and Nevaeh the death look*
*Johnson stares at us in dissapoint*
*Ellie says Nevaeh has mustache*
a;righty so that brings us to the much more prefered method that is radioactive dating that cna use a frew diff3eretn radiotctiive materials carbond ating also sint as goood because it decays materials i saw a post a while beack that said i dont knwo what carbon dating is but im willing to try anything *laughs* so last readser lets go with adrieana
*adrieana reads*
so some rocks begin to decay into other elemants so here we have an ezxample of potastiinmg a 40 where weorwudflafaf goet mroe arogand fasfasas aa realyly
decrease by hald foso if we welwaefahw;eio
we knwo that its about 1.5 billiomn years ago we makes some stimate basedon that if we have less argon and more postastion iits prob gonna be younger i told you somewherw your can prob figur ethis out so we will do the 7th grade version of this
*Ms.Johnson LAUGHS ALOT*
*rose gets mad at Nevaeh for nothing
*ms. johnson is sad becase “nevaeh isnt writing notes**
*cahir noises*
and when your done writing you can return your books to the counter we will pick up tmrw
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