mold fossil - Type of fossil that forms when sediments bury an organism and the sediments change into rock., rock, ice, tar, or amber - A preserved fossil forms when an entire organism or a part of an organism gets trapped in what?, 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., the law of superposition - What law states that each rock layer is older than the one above it?, 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?, the shorter time period a species lived - An index is better if what?, on top of older rocks - Sedimentary rocks pile up one atop the other. According to the Law of Superposition, younger rocks lie where?, the exact age of an object - What does relative age not tell?, relative age - What term do we use to compare the age of one object to the age of another object?, how many type of fossils are there? - six types, preserved fossils - 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.,

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