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Whats the diffrence between periods and eras?

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Whats the diffrence between periods and eras?

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I understand that the Earth is 4.6 BILLION years old.

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In radioactive dating,scientists first determine the amount of a radioactive element in a rock.

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In radioactive dating,scientists first determine the amount of a radioactive element in a rock.

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how fossils are formed

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I think it will be fun to make fossils.

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Carbon 14 has a half lifeof only 5730 years

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Carbon 14 has a half lifeof only 5730 years

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Different rocks look so cool like a crystals. I want to learn different types of fossils.

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the oldest layers are at the bottom

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I understand that fossils are parts of old animals.

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according to the law of superposition, in undisturbed horizontal sedimentary rock layers the oldest layer is at the bottom. Each higher layer is younger than the layers below it

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I think it's cool because, they find fossils and they put the them together to make an animal or species!

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SHARK TOOTH

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I struggle with figuring out the animal with just the fossils.

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Carbon-14 Dating is very confusing.

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igneous ,metamorphic ,and sedimentary

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the rock cycle

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I find fossils very interesting because it tells about the past.

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I want to learn more about fossils.

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i want to learn more about fossiles and bone structures

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Is my favorite part the Earth
3.8 and 4.28 billion years old

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most fossils form when living things die and are buried by sediment . the sediment slowly hardens into rock and preserves the shapes of the organism

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rock cycle

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im struggling with radioactive dating

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I understand Geologic Time because, basically it's just a chart talking about what came first in geologic time, and what came after and so one!

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I really don't  understand how radioactive decay happens?\

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My favorite part of the lesson was learning about the different eras.

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How old the earth was was really interesting 

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How old the earth was was really interesting 

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radioactive dating

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i want to learn more about uniformitarianism 

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i want to learn more about uniformitarianism 

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I understood half-life.

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I want to learn more about the different types of dinosaur fossils.

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plzz can someone help me how dating a rock what does it mean??

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im interested in the shark tooth

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I really don't understand how the Earth formed

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i am struggling with radioactive dating 

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i am struggling with radioactive dating 

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I struggled with learning about radioactive decay.

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FOSSILS ARE REALY REALLY REALLHY REALY COOL

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My favorite part is the geologic time scale.

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fossils can be found in all shapes

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the ice age happen after a contenial drift. XD

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my favorite part was when we learned about the fossils

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I'm struggling with Radioactive Dating because, i don't understand how elements usually don't change. And how elements release particles and energy in a process called Radioactive decay?!

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i think its cool that some fossils are turned to stone

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I want to learn more about the Cenozoic Era, Paleozic Era, and the Precambrian Time

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I want to learn more about the Cenozoic Era, Paleozic Era, and the Precambrian Time

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I understand what paleotologists are.

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i want to learn more about the fosile sycle and i want to make the fossile because it sounds cool to do'

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i want to learn more about the fosile sycle and i want to make the fossile because it sounds cool to do'

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My favorite part was when the packet showed us the huge megalodon shark tooth found in Egmont Key in Florida. The text said it was at LEAST 2 million years old!!

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I want to learn more about fossil rocks. Like are all fossils bones?

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a record of the geologic events and the evolution of life forms as shown in the fossil record.

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im struggling with the time line of the fossils and the name of them.

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I think it was very interesting how Earth formed 

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I think it was very interesting how Earth formed 

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will it ever happen again

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I think it's interesting because, you can learn about how old rocks are, and see what rock is the oldest.

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i found it cool that the ice age was after the Continental drift

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i want to learn how to make fossils

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i want to learn more about how some animals survived and struggled through the ice age

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i want to learn more about FOSSILS
by.melvin rios

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i think that the skeletons of the dinosuars are interesting

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i want to lean more on how the animals survived and how the struggled through the ice age

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i want to l learn how to dig up fossils

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Something I found interesting was about how a 9 year old boy found a megalodon shark tooth in the Egmont Key in Florida