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Earth's History

Index fossils A fossil that is useful for dating and correlating the strata in which it is found.
lithosphere the rigid outer part of the earth, consisting of the crust and upper mantle
extinction the state or process of a species, family, or larger group being or becoming extinct.
law of superposition sequence of rocks deposited in layers, the youngest layer is on top and the oldest on bottom
unconformities a surface of contact between two groups of unconformable strata
divergent boundary where two plates are moving away from each other and new crust is forming from magma that rises to the Earth's surface between the two plates
convergent boundary where two plates are moving towards each other causes a change in the Earth's surface
transform boundary where two plates slide rubbing against each other creating new crust
faults break in the rocks on the Earth's surface
plate tectonics theory explaining the structure of the earth's crust and many associated phenomena as resulting from the interaction of rigid lithospheric plates that move slowly over the underlying mantle
continental drift gradual movement of the continents across the earth's surface through time
absolute age true age of a rock or fossil
relative age age of a fossil organism, rock, or geologic feature or event defined relative to other organisms, rocks, or features or events rather than in terms of years
half-life time taken for the radioactivity of a specified isotope to fall to half its original value
Created by: jm64745