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uniformitarianism - 🧠 ANSWER ✔✔A principle that geologic processes that
occurred in the past can be explained by current geologic processes
Numeric dating - 🧠 ANSWER ✔✔Determining the ages of rocks using
analytical measurements
Superposition - 🧠 ANSWER ✔✔a principle that states that younger rocks lie
above older rocks if the layers have not been disturbed
contact effects - 🧠 ANSWER ✔✔A younger magma can bake older rocks
disconformity - 🧠 ANSWER ✔✔a type of unconformity in which the
sedimentary layers above and below the unconformity are parallel
,isotope - 🧠 ANSWER ✔✔Atoms of the same element that have different
numbers of neutrons
lateral continuity - 🧠 ANSWER ✔✔Principle that states that an original
sedimentary layer extends laterally until it tapers or thins at its edges.
half-life - 🧠 ANSWER ✔✔The time required for one half of the atoms of a
radioisotope to emit radiation an decay products
nonconformity - 🧠 ANSWER ✔✔A type of unconformity in which layered
sedimentary rocks lie on an erosion surface cut into igneous or
metamorphic rocks
angular unconformity - 🧠 ANSWER ✔✔tilted rocks are overlain by flat-lying
rocks
cross-cutting relations - 🧠 ANSWER ✔✔if one geologic feature cuts across
another, the feature that has been cut is older
original horizontality - 🧠 ANSWER ✔✔The principle states sedimentary
rocks are deposited in horizontal or nearly horizontal layers.
What evidence is there that the earth is old other than isotopic dating - 🧠
ANSWER ✔✔Annual ice and rock layerings
, What is the basis for the 4 Eras of the geological time scale - 🧠 ANSWER
✔✔The emergence of certain species, their evolution, and their extinction
Describe the different ways that isotopic dating is used for dating geologic
events - 🧠 ANSWER ✔✔Relative dating and numerical dating, used to
determine volcanic time scale.
How do the percentage of parent and daughter atoms relate to the age of
rocks - 🧠 ANSWER ✔✔Ratio of parent to daughter isotopes contained in
the minerals because their half-lives are already known.
Describe the 2 main factors that influence whether or not a creature will be
fossilized - 🧠 ANSWER ✔✔1: Rapid Burial
2; Hard Parts
Discuss how the geologic time scale was developed before the discovery of
numerical dating - 🧠 ANSWER ✔✔After scientists observed changes in the
fossils going from oldest to youngest sedimentary rocks
How do numerical dates of extraterrestrial rocks from our solar system
compare to numerical dates of the earth itself - 🧠 ANSWER ✔✔Therefore,
the ages of rocks from other planets and meteorites can be used as a
reference point to help date the age of the Earth.
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