Fossil - The preserved remains or traces of an organism that lived in the past usually more than 10,000 years ago., Mold fossil - Type of fossil that forms when sediments bury an organism and the sediments change into rock., Petrified fossil - type of fossil that forms when minerals soak into the buried remains replacing the remains and changing them into rock., Preserved fossil - Of fossil that forms when entire organisms or plants of organisms are prevented from decaying by being trapped and rock, eyes, tar, or amber., Carbonized fossil - Of fossil that forms when organisms or parts like leaves stems flowers fish are pressed between layer of soft mud or clay that harden squeezing almost all the decaying organism away leaving the carbon imprint in the rock., Trace fossil - Of fossil that forms when the mud or sand hardens to stone where a footprint trail or borough of an organism is left behind., The fossil record - what gives important information about past life and environments on Earth?, relative age - What term do we use to compare the age of one object to the age of another object?, The exact age of an object - what does relative age not tell? , The law of superposition - what law states that each rock layer is older than the one above it?, In sedimentary rocks - Where are most fossils formed? , 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? , on top of older fossils - according to the law of superposition younger fossils lie where?, An index is better if what? - The shorter time period a species lived.,

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