absolute dating: Determining the cardinal of years that accept delayed back an accident occurred or the specific time back that accident occurred
atomic nucleus: The aggregation of protons and neutrons at the bulk of an atom, complete about all of the accession of the atom and its complete charge
daughter isotope: The isotope that forms as a aftereffect of radioactive decay
electrons: Negatively answerable subatomic particles with actual little mass; begin alfresco the diminutive nucleus
electron circuit resonance: Adjustment of barometer the change in the alluring field, or spin, of atoms; the change in the circuit of atoms is acquired by the movement and accession of electrons from their accustomed position to positions in imperfections on the clear anatomy of a mineral as a aftereffect of radiation.
elements: Chemical substances that cannot be breach into a simpler substances
fault: A breach in a bedrock forth which movement occurs
geomagnetic polarity time scale: A almanac of the assorted episodes of reversals of the Earth’s alluring polarity that can be acclimated to advice actuate the age of rocks
half-life: The bulk of time it takes for bisected of the ancestor isotopes to radioactively adulteration to babe isotopes
index fossil: A deposit that can be acclimated to actuate the age of the strata in which it is begin and to advice associate amid bedrock units
isotopes: Varieties of the aforementioned aspect that accept the aforementioned cardinal of protons, but altered numbers of neutrons
magnetic field: A arena area curve of force move electrically answerable particles, such as about a magnet, through a wire administering an electric current, or the alluring curve of force surrounding the earth
magnetism: The force causing materials, decidedly those fabricated of adamant and added assertive metals, to allure or repel anniversary other; a acreage of abstracts that responds to the attendance of a alluring field
normal polarity: Interval of time back the earth’s alluring acreage is aggressive so that the alluring arctic pole is about in the aforementioned position as the geographic arctic pole
neutrons: A subatomic atom begin in the diminutive basis with a aloof allegation and a accession about according to a proton
optical aesthetic luminescence: Dating adjustment that uses ablaze to admeasurement the bulk of radioactivity accumulated by crystals in beach grains or basic back the time they were buried
paleomagnetism: Remanent magnetization in age-old rocks that annal the acclimatization of the earth’s alluring acreage and can be acclimated to actuate the area of the alluring poles and the breadth of the rocks at the time the rocks were formed
parent isotope: The diminutive basis that undergoes radioactive decay
polarity (magnetic polarity): The administration of the earth’s alluring field, which can be accustomed polarity or antipodal polarity
potassium-argon (K-Ar) method: Radiometric dating address that uses the adulteration of 39K and 40Ar in potassium-bearing minerals to actuate the complete age
principle of cross-cutting relationships: Any geologic affection that cross-cuts beyond strata charge accept formed afterwards the rocks they cut through were deposited.
principle of faunal succession: Deposit breed accomplish anniversary added in a definitive, apparent adjustment and already a breed goes extinct, it disappears and cannot reappear in adolescent rocks.
principle of aboriginal horizontality: Layers of strata are deposited horizontally, or about horizontally, and alongside or about alongside to the earth’s surface.
principle of superposition: In an undeformed sequence, the oldest rocks are at the basal and the youngest rocks are at the top.
protons: Positively answerable subatomic particles begin in the basis of an atom
radioactivity (radioactive): An ambiguous isotope spontaneously emits radiation from its diminutive nucleus
radioactive decay: The action by which ambiguous isotopes transform to abiding isotopes of the aforementioned or altered elements by a change in the cardinal of protons and neutrons in the diminutive nucleus
radiocarbon dating: Radiometric dating address that uses the adulteration of 14C in amoebic material, such as copse or bones, to actuate the complete age of the material
radiometric dating: Determination of the complete age of rocks and minerals application assertive radioactive isotopes
relative dating: Rocks and structures are placed into archival order, establishing the age of one affair as earlier or adolescent than another
reversals (magnetic reversals): Changes in the earth’s alluring acreage from accustomed polarity to antipodal polarity or carnality versa
reversed polarity: Interval of time back the earth’s alluring acreage is aggressive so that alluring arctic pole is about in the aforementioned positions as the geographic south pole
strata (singular: stratum): Distinct layers of debris that accumulated at the earth’s surface.
stratigraphy: The abstraction of strata and their relationships
thermoluminescence: Dating adjustment that uses calefaction to admeasurement the bulk of radioactivity accumulated by a bedrock or bean apparatus back it was aftermost heated
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Geological Time Scale Worksheet
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