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Earth History & Evol

Fossil The preserved remains/traces of an organism that lived in the past.
Relative Age "older" or "younger" comparing ages
Absolute Age The number of years since the rock was formed.
Uniformitarianism The slow change of Earth over time.
Continental Drift States that all continents used to be a part of a huge landmass, but broke apart and drifted to other locations.
Pangaea A supercontinent that existed during the late Paleozoic and early Mesozoic eras.
Extinct No longer existing.
Unconformity A buried surface separating two rocks of different ages.
Law of Superposition "in a series of stratified sedimentary rocks the lowest stratum is the oldest"
Index Fossil A fossil that is useful for dating and correlating the strata in which it is found.
Natural Selection Organisms better adapted to their environment will live longer.
Evolution The process of a species adapting/diversifying over time.
Adaptation A change or the process of change by which an organism or species becomes better suited to its environment.
Anatomy The bodily structure of an organism.
Intrusion The action or process of forcing a body of igneous rock between or through existing formations, without reaching the surface.
Unconformity A surface of contact between two groups of unconformable strata.
Mechanical Weathering The process of breaking big rocks into little ones.
Chemical Weathering The process of breaking rocks due to a chemical reaction.
Variation A different or distinct form or version of something.
Geologic Time Scale A system of chronological dating that relates geological stratigraphy (the study of the Earth's layers) to time.
Radioactive Decay The process by which an unstable atomic nucleus loses energy.
Created by: Madelyn_Schultz