Rock Dating 5/2/17. Catalyst: How do scientists know how old artifacts are and when ancient events happened in earth s history?
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1 Catalyst: How do scientists know how old artifacts are and when ancient events happened in earth s history? Rock Dating 5/2/17 44L 44R
2 Relative Dating/Absolute Dating Relative Dating: An estimated age based on the comparison of one thing to another. EX: Your grandfather is older than you
3 Catalyst: How do scientists know how old artifacts are and when ancient events happened in earth s history? Rock Dating 5/2/17 Relative Dating: An estimated age based on the comparison of one thing to another. 44L 44R
4 Relative Dating/Absolute Dating Absolute Dating: An exact age based on the physical, chemical and life properties of the materials or artifacts. EX: You are 12, your grandfather is 77 years old.
5 Catalyst: How do scientists know how old artifacts are and when ancient events happened in earth s history? Rock Dating 5/2/17 Relative Dating: An estimated age based on the comparison of one thing to another. Absolute Dating: An exact age based on the physical, chemical and life properties of the materials or artifacts. 44L 44R
6 Law of Superposition In a sequence of sedimentary rock layers, each layer of rock is older than the layer above it and younger than the rock layer below it. Younger sedimentary rocks are deposited on top of older sedimentary rocks.
7 Catalyst: How do scientists know how old artifacts are and when ancient events happened in earth s history? Rock Dating 5/2/17 Relative Dating: An estimated age based on the comparison of one thing to another. Absolute Dating: An exact age based on the physical, chemical and life properties of the materials or artifacts. Superposition 44L Younger sedimentary rocks are deposited on top of older sedimentary rocks. 44R
8 Is this really true? Cut out the continents Cut along the outer line Color each set of fossil bands a different color according to the reading Update the Key with your colors Put the pieces together to form a Supercontinent
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10 TPS Write your answers to the following questions on the 41R page of your notebook: 1. Why couldn t the organisms have traveled across the oceans we have today? 2. We know that Antarctica is very cold today. How can tropical plant fossils be found on Antarctica? 3. What forces would be strong enough to move the land masses such great distances?
11 J-TPS Share your answers to the following questions with your elbow partner: 1. Why couldn t the organisms have traveled across the oceans we have today? 2. We know that Antarctica is very cold today. How can tropical plant fossils be found on Antarctica? 3. What forces would be strong enough to move the land masses such great distances?
12 J-TPS Why couldn t the organisms have traveled across the oceans we have today?
13 J-TPS Why couldn t the organisms have traveled across the oceans we have today? The Atlantic Ocean is 2848 kilometres (1770 mi) A human would take 81 days to swim across
14 J-TPS We know that Antarctica is very cold today. How can tropical plant fossils be found on Antarctica?
15 J-TPS We know that Antarctica is very cold today. How can tropical plant fossils be found on Antarctica? Look at your map you just created Antarctica was once near the equator The climate near the equator is warm and tropical
16 J-TPS What forces would be strong enough to move the land masses such great distances? Scientists believe Earth s plates move through a process called Continental Drift Extreme forces move the plates centimeters a year
17 Radiometric Dating Radioactive elements were incorporated into the Earth when the Solar System formed. All rocks and minerals contain tiny amounts of these radioactive elements. Radioactive elements are unstable; they break down into more stable atoms over time, a process known as radioactive decay. Radioactive decay occurs at a constant rate. A method of dating rocks/ artifacts by determining how much of a radioactive element is present in a sample
18 Catalyst: How do scientists know how old artifacts are and when ancient events happened in earth s history? Rock Dating 5/2/17 Relative Dating: An estimated age based on the comparison of one thing to another. Absolute Dating: An exact age based on the physical, chemical and life properties of the materials or artifacts. 44L Superposition Younger sedimentary rocks are deposited on top of older sedimentary rocks. Radiometric Dating A method of dating rocks/ artifacts by determining how much of a radioactive element is present in a sample 44R
19 Candy Half Lives
20 Catalyst: Rock Dating 5/2/17 How do scientists know how old artifacts are and when ancient events happened in earth s history? Reflection: In what situation would you use relative dating? Absolute dating? Provide an example for both. 44L 44R
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