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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