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Radioactive Decay
What is the process of breaking down? Answer with a single words or term.
Radiocarbon Dating
________: Uses the Radioactive Isotope Carbon- 14 found in all living things.
Key bed
A(n) ________ is a thin, widespread layer, usually of volcanic ash that can be used to correlate an exact.
Radiometric Ages
What are by measuring the ratio of parent isotope to? Answer with a single words or term.
❏
________ Geologists determine absolute ages by using properties of the atoms that make up materials.
Fossil
A(n) ________ is any evidence of earlier life preserved in the rock.
Radioactive Isotopes
________: Atoms of elements that give off radiation from their.
Outcrop
What is exposed rock layers at the earths surface? Answer with a single words or term.
❏ Cambrian Period
________- Trilobites & Brachiopods are the most common fossil.
Metallic minerals
What are found in Precambrian rocks? Answer with a single words or term.
North America
What was over? Answer with a single words or term.
Trilobites
What are found? Answer with a single words or term.
Hard parts
________ have been replaced by mineral material (petrified wood)
Radioactive Dating
________: Used to date back in time, certain rocks contain.
Absolute Age
________ is the age in years, of a rock or other object.
❏ Precambrian time
What is all of the geologic time before the Paleozoic Era, Precambrian rocks lack? Answer with a single words or term.
Absolute Time
________: Identifies the actual dates of geologic events (ex: the.
❏
________ Sometimes a lot of energy is given off during this process.
Radioactive Decay
________: The process by which a radioactive isotope changes.
