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Fossils BPRVTHS

Fossil Flashcards for BP freshmen

QuestionAnswer
Evolution change in species over time
extinction a species that has completely died out
mass extinction much extinction at the same time
sediment small pieces of rock, shell or other material that are broken down over time
sedimentary rock sediments that become rock over time
petrification process by which once living material is replaced by minerals, turning it to stone
fossil evidence of a once living thing
mold empty space left in a rock after an organism has decayed
cast filled-in mold that has the shape of the original organism
imprints thin objects, like leaves and feathers, leave imprints in the mud. When the mud hardens the imprints are preserved as fossils
freezing whole organism becomes frozen in ice
amber tree resin traps organisms, the resin hardens to form amber
trace fossils evidence of animal activities: tracks, trails, footprints, and burrows
micro fossils fossils of single-celled organisms
Law of Superposition states that in undisturbed sedimentary rocks, each layer is older than the one above it and younger than the one under it
index fossil fossil of an organism that existed on earth for only a short period of time that can be used by scientists to determine the relative age of the rock
half-time dating measurement of the amount of time it takes for one half of the atoms of a sample of radioactive element to decay, determines the absolute age of a fossil
absolute age the precise time an event occurred
relative age approximate date in which an event occurred
geologic time the length of time that the earth has excised
four eras of geologic time Precambrian, Paleozoic, Mesozoic, Cenozoic
Created by: mrsnieves
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