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8th Grade Science

Science Fossils

TermDefinition
fossil the trace or remains of an organisms that lived long ago, most commonly preserved in sedimentary rock
petrified fossil happens when an organism's tissues are replaced by minerals
mold forms when hard parts of an organism are buried in sediment, such as sand, silt, or clay
casts forms as the result of a mold. minerals and sediment that are left in the mold make a cast. a cast is the opposite of a mold
carbon films thin layer of carbon left behind can show an organism's delicate parts, like leaves on a plant
trace fossil is a fossilized structure that formed in sedimentary rock by animal activity on or in soft sediment
preserved remains remains of organisms are preserved in substances such as tar, amber, or ice
paleontologist scientists who study fossils
fossil record all the information that paleontologists have gathered about past life
evolution gradual change in living things over long periods of time
extinct no longer exists and will never again live on Earth
uniformitarianism geological process that happened in the past are explained by current geological processes (volcanoes)
unconformity is a break in the geologic record that is made when rock layers are eroded or when sediment is not deposited for a long period of time
Rock cycle Series of process In which rocks form, changes from one type to another, is broken down or melted, and forms again by geologic processes
Compaction Is a process where layers build up as pressure increases the bottom layers stick together to form solid rock
Sedimentary Rocks Made by compaction and cementation, forms when sediments are compacted together by pressure and are cemented together when minerals form from solutions
Created by: SSC 8th LA