Describe absolute dating

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There are two basic approaches: relative age dating, and absolute age dating.Here is an easy-to understand analogy for your students: relative age dating is like saying that your grandfather is older than [email protected]{font-family:'q-icons';src:url(//quoracdn.net/-fonts.q-icons.q-icons.eoteaabd749c1c44922.eot);src:url(//quoracdn.net/-fonts.q-icons.q-icons.woff2101cc98410fd63e6.woff2) format('woff2'),url(//quoracdn.net/-fonts.q-icons.q-icons.woffb4d3c3ece4532bec.woff) format('woff'),url(//quoracdn.net/-fonts.q-icons.q-icons.ttf377170866a906859.ttf) format('truetype'),url(//quoracdn.net/-fonts.q-icons.q-icons.svg3014a7e5d1294672.svg) format('svg');font-weight:normal;font-style:normal}@font-face{font-family:'q_serif';src:url(//quoracdn.net/-fonts.q_serif.q_serif_regular.eot724740ce9faa6d02.eot);src:url('/static/fonts/q_serif/q_serif_regular.eot? #iefix') format('embedded-opentype'),url(//quoracdn.net/-fonts.q_serif.q_serif_regular.woff2b660b09e916538fa.woff2) format('woff2'),url(//quoracdn.net/-fonts.q_serif.q_serif_regular.wofff5de2fe1e48d7cb1.woff) format('woff'),url(//quoracdn.net/-fonts.q_serif.q_serif_regular.ttfde71fa0eaacf4d6e.ttf) format('truetype');font-weight:400;font-style:normal}@font-face{font-family:'q_serif';src:url(//quoracdn.net/-fonts.q_serif.q_serif_regular_italic.eot0e70722bfd809f9d.eot);src:url('/static/fonts/q_serif/q_serif_regular_italic.eot? #iefix') format('embedded-opentype'),url(//quoracdn.net/-fonts.q_serif.q_serif_regular_italic.woff29d63924c2b6a1fd2.woff2) format('woff2'),url(//quoracdn.net/-fonts.q_serif.q_serif_regular_italic.woffe50f53817c85b798.woff) format('woff'),url(//quoracdn.net/-fonts.q_serif.q_serif_regular_italic.ttf445671494147f641.ttf) format('truetype');font-weight:400;font-style:italic}@font-face{font-family:'q_serif';src:url(//quoracdn.net/-fonts.q_serif.q_serif_semibold.eota20bcd991fb37590.eot);src:url('/static/fonts/q_serif/q_serif_semibold.eot? #iefix') format('embedded-opentype'),url(//quoracdn.net/-fonts.q_serif.q_serif_semibold.woff263b31550416a2510.woff2) format('woff2'),url(//quoracdn.net/-fonts.q_serif.q_serif_semibold.woff9c8b77aa17742fc1.woff) format('woff'),url(//quoracdn.net/-fonts.q_serif.q_serif_semibold.ttfe3295a33efa03b40.ttf) format('truetype');font-weight:bold;font-style:normal}@font-face{font-family:'q_serif';src:url(//quoracdn.net/-fonts.q_serif.q_serif_semibold_italic.eotb4747289576685fb.eot);src:url('/static/fonts/q_serif/q_serif_semibold_italic.eot? #iefix') format('embedded-opentype'),url(//quoracdn.net/-fonts.q_serif.q_serif_semibold_italic.woff2f553fc885641825f.woff2) format('woff2'),url(//quoracdn.net/-fonts.q_serif.q_serif_semibold_italic.woffceaf44b10a2d416a.woff) format('woff'),url(//quoracdn.net/-fonts.q_serif.q_serif_semibold_italic.ttfd15567dd8175ed85.ttf) format('truetype');font-weight:bold;font-style:italic}@font-face{font-family:'q_sans';src:url(//quoracdn.net/-fonts.q_sans.q_sans_regular.eotc0c3eea9179978ff.eot);src:url('/static/fonts/q_sans/q_sans_regular.eot? #iefix') format('embedded-opentype'),url(//quoracdn.net/-fonts.q_sans.q_sans_regular.woff2052ea1356ccae2f0.woff2) format('woff2'),url(//quoracdn.net/-fonts.q_sans.q_sans_regular.woff5cc5776a8852cb2c.woff) format('woff'),url(//quoracdn.net/-fonts.q_sans.q_sans_regular.ttf7214d245aa610eb3.ttf) format('truetype');font-weight:400;font-style:normal}@font-face{font-family:'q_sans';src:url(//quoracdn.net/-fonts.q_sans.q_sans_medium.eotd5a95b804e3ee936.eot);src:url('/static/fonts/q_sans/q_sans_medium.eot?

Geologists draw on it and other basic principles ( to determine the relative ages of rocks or features such as faults.

Relative age dating also means paying attention to crosscutting relationships.

Say for example that a volcanic dike, or a fault, cuts across several sedimentary layers, or maybe through another volcanic rock type.

Pretty obvious that the dike came after the rocks it cuts through, right?

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With absolute age dating, you get a real age in actual years.

It’s based either on fossils which are recognized to represent a particular interval of time, or on radioactive decay of specific isotopes. Based on the Rule of Superposition, certain organisms clearly lived before others, during certain geologic times.

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