1 / 26

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

maia-watts
Download Presentation

Science Today :

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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?

More Related