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Science Today :

Science Today :. Future Paleontologist Project Presentations Today’s We’ll also Hand In: EH Unit Study Guide Rock Layer Puzzles Packet (if you still have this) “Time Marches On” Reading Guide (6.1). 3/7: Science Starter. List the rock layers & events in order from oldest to

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Science Today :

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  1. Science Today: Future Paleontologist Project Presentations Today’s We’ll also Hand In: • EH Unit Study Guide • Rock Layer Puzzles Packet (if you still have this) • “Time Marches On” Reading Guide (6.1)

  2. 3/7: Science Starter List the rock layers & events in order from oldest to youngest.

  3. Important Science Dates: Mon. 3/7: • Rock layer puzzles packet due Wed. 3/9: • Sign-up Future Paleontologist Presentations Thurs. 3/10: • EH Unit Test (& study guide due) • Future Paleontologist Application Projects Due (Presentations will start today) Fri. 3/11: • Future Paleontologist Presentations-cont.

  4. Important Dates: Thurs. 3/10: EH Unit Test • Application Project Presentations • EH Study Guide Due Fri. 3/11: • Application Project Presentations-cont.

  5. 3/9: Science Starter • How are Relative Dating & Absolute Dating Similar? How are they different?

  6. 3/9: Science Starter • How are Relative Dating & Absolute Dating Similar? How are they different?

  7. Science Starter 3/8: 1. True or False? Most organisms that have lived on Earth died and decomposed without leaving a fossil. 2. After 1 half life, what are the percentages of unstable atoms and stable atoms in a radioactive element? • A. 100% unstable atoms, 0% stable atoms • B. 50 % unstable atoms, 50% stable atoms • C. 25% unstable atoms, 75% stable atoms 3. Mrs. Keefe’s friend has 2 naughty dogs that she frequently has to dog-sit (It’s horrible!) . Atza is 4 years old and Coby is 1 year old. Do you know the dogs’ relative or absolute ages?

  8. 3/7 Science Starter: 1. What word describes the time it takes for half of a radioactive sample to decay? • Name 2 types of radiometric dating. • If anyone brings cookies as part of their application project, what must we not let Blake do?

  9. 2/28: Science Starter: Use your book, chapter 6, section 3 to find the answers to the following questions. 1. What is absolute dating? • What word describes the time it takes for half of a radioactive sample to decay? • Name 2 types of radiometric dating.

  10. Absolute Dating Chapter 6, section 3

  11. Absolute Dating: determining the actual age in years of an event or object. iPods-10/23/2001 CDs-1980s Cassette Tapes-1970s-90s 8-Tracks-1960s-80s Records-early 1900s

  12. Radioactive Dating of Rocks: • To determine the actual age of a fossil or rock scientists use radioactive dating and element half life to determine the ages of rocks (Absolute Dating)

  13. Isotope: An atom with the same # of protons but with different # of neutrons. • Some isotopes are radioactive (unstable)

  14. Isotopes-cont. • Unstable Isotopes will change (& try to become more stable) over time • An Unstable Isotope (radioactive)works towards stabilityand changes into another kind of element. • Ex. Potassium-40 decays to argon and calcium.

  15. Radioactive Decay: • Radioactive decay – The process where radioactive substances (unstable) break down (change) into more stable substances. • Occurs at a steady (predictable)rate

  16. Radioactive decay (p. 162) The decay process occurs at a steady, constant rate Radiometric Dating: (ratio) Parent material Daughter material Stable Unstable

  17. Radiometric Dating of Rocks: Radiometric Dating: process of determining the exact age of a sample, based upon the ratio of parent material (old stuff) to daughter material (new stuff) .

  18. Half Life: the length of time it takes for half of the radioactive atoms to change from an unstable form into a stable form(p. 163) • When rock forms = 100% unstable, 0% stable • After 1 half life = 50% unstable 50% stable • After 2 half lives = 25% unstable 75% stable

  19. Types of Radiometric Dating • Potassium-Argon Method: • Potassium  Half-life = 1.3 billion years 2. Uranium-Lead Method: • Uranium  Half-life = 4.5 billion years • Rubidium-Strontium Method: • Rubidium  Half-life = 49 billion years • Carbon-14 Method: • Carbon  Half-life = 5,730 years

  20. Johnsonium 1027: half life of 5 years Schmelingium 327 5 Years 5 Years 50% Keefeium 50% Meyerium 1 half-life 25% Keefeium 75% Meyerium 2 half-lives 100% Keefeium 0 half-life

  21. Uranium 235: half-life 700 million yrs Lead 207 1 half-life 2 half-lives 0 half-lives 50% Uranium 235 25% Uranium 235 100% Uranium 235 50% Lead 207 75% Lead 207 0% Lead 207 Rock Formation 0 years old 700 million years old 1400 million y.o.

  22. Objectives: (you should be able to…) • Explain how fossils are used to establish the Earth’s history • Determine the difference between absolute and relative time • Know the importance of index fossils in geologic time • Understand how half life is used to date rocks • Understand where fossil fuels come from and the difference between renewable and nonrenewable resources

  23. True or False? Most organisms that have lived on Earth died and decomposed without leaving a fossil. 2. After 1 half life, what are the percentages of unstable atoms and stable atoms in a radioactive element? • A. 100% unstable atoms, 0% stable atoms • B. 50 % unstable atoms, 50% stable atoms • C. 25% unstable atoms, 75% stable atoms

  24. 3. One example of a nonrenewable resource is ___________. • A. wind power • B. coal • C. wood 4. Ms. Johnson’s friend has 2 naughty dogs that she frequently has to dog-sit (It’s horrible!) . Atza is 4 years old and Coby is 1 year old. Do you now know the dogs’ relative or absolute ages?

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