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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