Examlex
Most adolescents who use marijuana use it regularly.
Radiocarbon Dating
A method for determining the age of an object containing organic material by using the properties of radiocarbon, a radioactive isotope of carbon.
Sedimentary Layer
A layer of material, often deposited by water, wind, or ice, that forms part of the sedimentary rock sequence.
Ancient Earth
Refers to the period in Earth's history that spans from the formation of the planet approximately 4.5 billion years ago until the dawn of recorded history.
Short-lived Isotopes
Radioactive isotopes that decay rapidly, often used in medical imaging and studies of geological and planetary processes.
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