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Interpreting

Geologic History 2

TermDefinition
Half-Life Amount of time it takes for half of a radioactive substance to decay
Absolute Age Actual age stated in a certain amount of time: example: Ms. Crouse is 35 years old.
Superposition Principle that sedimentary rocks on the bottom are older than layers on the top of a sequence
Absolute Dating Finding the actual age of a rock
Original Horizontal Idea that all sedimentary rocks were deposited in flat layers
Carbon 14 Dating Using this radioactive material found in all organisms an absolute age can be determined
Isotopes Unstable form of an element: radioactive element
Extrusion Igneous rock that flows out onto the surface and then cools: volcanic
Geologic Time Scale Age and events that happened on Earth put on a "geologic calendar"
Inclusions rock Fragments found included in another rock: older than the rock they are found in
Volcanic Ash Layers Marker beds produced by deposition from volcanic eruptions.
Created by: sjjwhite
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