Mold fossil - Type of fossil that forms when sediments bury an organism and the sediments change into rock., Petrified fossil (permineralized fossil) - Type of fossil that forms when minerals soak into the buried remains, replacing the remains, and changing them into rock., Preserved fossil - Type of fossil that forms when entire organisms or parts of organisms are prevented from decaying by being trapped in rock, ice, tar, or amber., Trace Fossil - Type of fossil that forms when the mud or sand hardens to stone where a footprint, trail, or burrow of an organism was left behind., Relative Age - What term do we use to compare the age of one object to the age of another object?, Law Of Superstition - What law states that each rock layer is older than the one above it?, In sedimentary rocks - Where are most fossils formed?, On top of older rocks - Sedimentary rocks pile up one atop the other. According to the Law of Superposition, younger rocks lie where?, On top of older fossils - According to the Law of Superposition, younger fossils lie where?, trilobite - What is a key example of an index fossil?, Ordering of rock layers and Index fossils - What are the two basic methods to determine the relative age of rocks and fossils?, If the rock or fossil is farther down in the rock layers. - Using the law of superposition (layering), the relative age of the rock or fossil in the rock is older if what?,

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