Flashcards - NES General Science: Historical Geology

Flashcards - NES General Science: Historical Geology
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An era is a span of time marked by character, events, changes on earth, etc
beta decay
In nuclear physics, beta decay is a type of radioactive decay in which a beta ray, and a respective neutrino are emitted from an atomic nucleus
Half-life is the time required for a quantity to reduce to half its initial value
In the fields of chronology and periodization, an epoch is an instant in time chosen as the origin of a particular era
Charles Lyell
Sir Charles Lyell, 1st Baronet, FRS was a British lawyer and the foremost geologist of his day
Gradualism, from Latin gradus , is a hypothesis, a theory or a tenet assuming that change comes about gradually or that variation is gradual in nature
numerical dating
Absolute dating is the process of determining an age on a specified chronology in archaeology and geology
radioactive decay
Radioactive decay is the process by which the nucleus of an unstable atom loses energy by emitting radiation, including alpha particles, beta particles, gamma rays, and conversion electrons
relative dating
Relative dating is the science of determining the relative order of past events , without necessarily determining their absolute age,
An unconformity is a buried erosional or non-depositional surface separating two rock masses or strata of different ages, indicating that sediment deposition was not continuous
fossil preservation
Fossils are the preserved remains or traces of animals, plants, and other organisms from the remote past
Radiocarbon dating
Radiocarbon dating is a method for determining the age of an object containing organic material by using the properties of radiocarbon , a radioactive isotope of carbon

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