vocabulary for 8th science EOG

Term Definition
fossil preserved remains or traces of an organism that lived in the past
trace fossil forms when the mud or sand hardens to stone where a footprint, trail or burrow of an organism was left behind
geologic time scale record of the major events and diversity of life forms present in Earth's history
relative dating tells the age of one object compared to the age of another object
superposition for undisturbed layers of rock, the oldest layer is at the bottom and the layers become younger as you go up
index fossil fossil used to date rock layers
radiometric dating uses the amount of radioactive materials in rock to determine the exact age of an object
fault break in Earth's crust that is formed due to the movement of rock on either side
plate tectonics movement of Earth's plates continually change the shape of Earth's crust
continental drift theory that Earth's continents were once together, broke apart, and drifted to their current locations
subduction forcing of one plate beneath another

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