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continental drift hypothesis stating the continents slowly drift parallel to earths surface
uniforitarianism the idea that earths process at work today were also at work in earths past
superpostion the theory that undesterbed layers or rock have the oldest layers on the bottom and the youngest on the top
pangaea ancient super continent that began breaking about 200 millions years ago
plate tectonics theory that explains how lithospheric plates move and ineract causing major geologic features and events
fossil records the history of all known fossil and their placements in formation of rock and position in time
absolute dating calculating by using half life of certain isotopes
estimation am eproxmate calculation of quantity
radioactive decay when an unstable atomic nucleus changes to another nucleus by emitting particles and energy
igneous rock rock that forms from magma or lava
sedimentary rock rock that is broken down into smaller pieces or dissolved in water
relative age age based on objects found at the same time
half life the time it takes a given amount of a radioactive isotope to decay to half its original amount
atoms smallest unit of matter a nucleous surrounded by protons and electrons
index fossils the fossilized remaines of an organism that existed over vast areas for a short period of time
Created by: 200502829