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Fossils / Geologic

Ch. 4 from Changing Earth textbook

QuestionAnswer
absolute age specific age of rock or fossil; example
extinct gone forever; examples
extrusion volcanic lava layer on surface
half-life time for half # of radioactive atoms to change (decay) into different type of atoms
intrusion magma squeezed up from below; younger than layers it cuts through
invertebrates animals without backbone; earliest animals; examples
law of superposition
mass extinction
petrified fossil living thing dies and body / parts slowly replaced by minerals; example
radioactive decay one element changes over time to another element; gives off energy; used to figure out how old rocks/fossils are
relative age
trace fossil evidence left by living thing long ago; examples: tracks, tunnels, turds, nests, etc.
trilobite
uniformitarianism geology that happened in past, happens now, and will in future too; constant change in Earth; James Hutton idea
sedimentary fossils usually found in this type of rock
4.6 billion years old
birds Robert Bakker and other paleontologist think dinosaurs evolved into this
unconformity layer eroded away, then new layers formed above
Created by: karpeleniaj
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