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Earth Science

E.S. Chapter 12 Sections 1-4

TermDefinition
uniformitarianism _________________ which simply states that the physical, chemical, and biological laws that operate today have operated in the geologic past
law of superposition an undeformed sequence of sedimentary rocks, each layer is older than the one above it and younger than the one below it
unconformity An ____________ indicates a long period during which deposition stopped, erosion removed previously formed rocks, and then deposition resumed.
extinct organism one that no longer exists on Earth
fossil the remains or traces of an organism preserved from a geologic past
theory of evolution _______ ___ __________ states that life forms have changed over time, or evolved, from simpler to more complex forms
natural selection In ________ _________, individuals that are better adapted to their environment are more likely to survive and reproduce than others of the same type.
radioactive decay During radioactive decay, unstable atomic nuclei spontaneously break apart, or decay, releasing energy
carbon-14 Radiocarbon dating is a method for determining age by comparing the amount of _________ to the amount of carbon-12 in a sample.
geologic time scale a record that includes both geologic events and major developments in the evolution
Eons represents the longest interval of geological time
Created by: VickieJ10
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