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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