fossil, The preserved remains or traces of an organism that lived in the past, usually more than 10,000 years ago, is known as what?, environmental conditions, Essential to the study of fossil formation are (1) how fossils are formed and (2) the ________ ________ that favor fossil formation., Mold Fossil, Type of fossil that forms when sediments bury an organism and the sediments change into rock.Mold fossil, Petrified fossil (permineralized fossil), Type of fossil that forms when minerals soak into the buried remains, replacing the remains, and changing them into rock., Trace fossil, fossil that forms when the mud or sand hardens to stone where a footprint, trail, or burrow of an organism was left behind., carbonized 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., law of superposition, Which law states that each rock layer is older than the one above it?, on top of older fossils, What law states that each rock layer is older than the one above it?, trilobite, What is a key example of an index fossil?, on top of older rocks, Sedimentary rocks pile up one atop the other. According to the Law of Superposition, younger rocks lie where?, the fossil record, What gives important information about past life and environments on Earth?, rock tar ice or amber, A preserved fossil forms when an entire organism or a part of an organism gets trapped in what?.

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