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:
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?
Half-Life Atoms used in geologic dating have long half- lives ParentDaughterHalf-Life Uranium-238Lead-2064,470 million years Uranium-235Lead-207704 million years Potassium-40Argon-401,250 million years Rubidium-87Strontium-8748,800 m. y. Carbon-14Nitrogen-145,730 years
Assigning Ages Using the proportion of daughter atom in a sample, its age can be determined http://upload.wikimedia.org/wikiversity/en/thumb/4/4b/Radiometricdatingmineral.png/400px-Radiometricdatingmineral.png