Presentation on theme: "Introduction to Absolute (Radiometric) Dating. Learning Targets 4a) I can distinguish between absolute and relative dating. (DOK 1) 4b) I can define what."— Presentation transcript:
Introduction to Absolute (Radiometric) Dating
Learning Targets 4a) I can distinguish between absolute and relative dating. (DOK 1) 4b) I can define what an isotope is and describe how radioactive isotopes decay (DOK 1) 4e) I can identify and analyze key strengths and limitations of using radioactive decay in absolute dating. (DOK 1-2) Essential Question How do scientists use absolute dating to build a model of the Earth’s history?
Isotopes Two or more of the same element with different masses. Have the same number of protons but number of neutrons changes.
Radioactivity o Some atoms are not stable o These atoms emit particles to achieve stability
Radioactivity There are three types of particles emitted: 1.Alpha particles 2.Beta Particles 3.Gamma Rays
Half-Life Atoms used in geologic dating have long half- lives ParentDaughterHalf-Life Uranium-238Lead-2064,470 million years Uranium-235Lead million years Potassium-40Argon-401,250 million years Rubidium-87Strontium-8748,800 m. y. Carbon-14Nitrogen-145,730 years