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Index fossils help scientists estimate the age of a rock because index fossils species only existed for a relatively short time. What happened to the species that are now used
mold
provides evidence of an animal\'s action
bones are very strong, but fossils are fragile and porous
They are now extinct
the oldest sedimentary rock layer is found at the bottom
widely distributed and represent a type of organism that existed for a short amount of time
always younger than rock layers around it
It was once below an ocean
A trace fossil:
mold
provides evidence of an animal\'s action
bones are very strong, but fossils are fragile and porous
They are now extinct
the oldest sedimentary rock layer is found at the bottom
widely distributed and represent a type of organism that existed for a short amount of time
always younger than rock layers around it
It was once below an ocean
When scientists find a hollow area in sediment in the shape of an organism, they have found a:
mold
provides evidence of an animal\'s action
bones are very strong, but fossils are fragile and porous
They are now extinct
the oldest sedimentary rock layer is found at the bottom
widely distributed and represent a type of organism that existed for a short amount of time
always younger than rock layers around it
It was once below an ocean
Fossils and bones are different because:
mold
provides evidence of an animal\'s action
bones are very strong, but fossils are fragile and porous
They are now extinct
the oldest sedimentary rock layer is found at the bottom
widely distributed and represent a type of organism that existed for a short amount of time
always younger than rock layers around it
It was once below an ocean
To be useful, an index fossil must be:
mold
provides evidence of an animal\'s action
bones are very strong, but fossils are fragile and porous
They are now extinct
the oldest sedimentary rock layer is found at the bottom
widely distributed and represent a type of organism that existed for a short amount of time
always younger than rock layers around it
It was once below an ocean
The Law of Superposition states that:
mold
provides evidence of an animal\'s action
bones are very strong, but fossils are fragile and porous
They are now extinct
the oldest sedimentary rock layer is found at the bottom
widely distributed and represent a type of organism that existed for a short amount of time
always younger than rock layers around it
It was once below an ocean
An intrusion is:
mold
provides evidence of an animal\'s action
bones are very strong, but fossils are fragile and porous
They are now extinct
the oldest sedimentary rock layer is found at the bottom
widely distributed and represent a type of organism that existed for a short amount of time
always younger than rock layers around it
It was once below an ocean
A researcher found shark fossils on top of a mountain. This evidence suggests which of the following about this region?
mold
provides evidence of an animal\'s action
bones are very strong, but fossils are fragile and porous
They are now extinct
the oldest sedimentary rock layer is found at the bottom
widely distributed and represent a type of organism that existed for a short amount of time
always younger than rock layers around it
It was once below an ocean
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