A petrified fossil forms when
Rock layers are _____________than the intrusions that cut across them.
Fossils are almost always found in
When rock layers are lost due to erosion, this is known as
The Precambrian time began after the formation of the Earth about_____ years ago.
Fossils provide evidence for all of the following EXCEPT
An index fossil
mold fossils form when
Leaf prints on rocks are called
the geoligical eras in order from oldest to youngest is
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