Ce diaporama a bien été signalé.
Nous utilisons votre profil LinkedIn et vos données d’activité pour vous proposer des publicités personnalisées et pertinentes. Vous pouvez changer vos préférences de publicités à tout moment.

Ii. e. history of the earth

1 435 vues

Publié le

geologic timescale

Publié dans : Formation
  • DOWNLOAD FULL BOOKS, INTO AVAILABLE FORMAT ......................................................................................................................... ......................................................................................................................... 1.DOWNLOAD FULL. PDF EBOOK here { https://tinyurl.com/y3nhqquc } ......................................................................................................................... 1.DOWNLOAD FULL. EPUB Ebook here { https://tinyurl.com/y3nhqquc } ......................................................................................................................... 1.DOWNLOAD FULL. doc Ebook here { https://tinyurl.com/y3nhqquc } ......................................................................................................................... 1.DOWNLOAD FULL. PDF EBOOK here { https://tinyurl.com/y3nhqquc } ......................................................................................................................... 1.DOWNLOAD FULL. EPUB Ebook here { https://tinyurl.com/y3nhqquc } ......................................................................................................................... 1.DOWNLOAD FULL. doc Ebook here { https://tinyurl.com/y3nhqquc } ......................................................................................................................... ......................................................................................................................... ......................................................................................................................... .............. Browse by Genre Available eBooks ......................................................................................................................... Art, Biography, Business, Chick Lit, Children's, Christian, Classics, Comics, Contemporary, Cookbooks, Crime, Ebooks, Fantasy, Fiction, Graphic Novels, Historical Fiction, History, Horror, Humor And Comedy, Manga, Memoir, Music, Mystery, Non Fiction, Paranormal, Philosophy, Poetry, Psychology, Religion, Romance, Science, Science Fiction, Self Help, Suspense, Spirituality, Sports, Thriller, Travel, Young Adult,
       Répondre 
    Voulez-vous vraiment ?  Oui  Non
    Votre message apparaîtra ici
  • DOWNLOAD FULL BOOKS, INTO AVAILABLE FORMAT ......................................................................................................................... ......................................................................................................................... 1.DOWNLOAD FULL. PDF EBOOK here { https://tinyurl.com/y8nn3gmc } ......................................................................................................................... 1.DOWNLOAD FULL. EPUB Ebook here { https://tinyurl.com/y8nn3gmc } ......................................................................................................................... 1.DOWNLOAD FULL. doc Ebook here { https://tinyurl.com/y8nn3gmc } ......................................................................................................................... 1.DOWNLOAD FULL. PDF EBOOK here { https://tinyurl.com/y8nn3gmc } ......................................................................................................................... 1.DOWNLOAD FULL. EPUB Ebook here { https://tinyurl.com/y8nn3gmc } ......................................................................................................................... 1.DOWNLOAD FULL. doc Ebook here { https://tinyurl.com/y8nn3gmc } ......................................................................................................................... ......................................................................................................................... ......................................................................................................................... .............. Browse by Genre Available eBooks ......................................................................................................................... Art, Biography, Business, Chick Lit, Children's, Christian, Classics, Comics, Contemporary, Cookbooks, Crime, Ebooks, Fantasy, Fiction, Graphic Novels, Historical Fiction, History, Horror, Humor And Comedy, Manga, Memoir, Music, Mystery, Non Fiction, Paranormal, Philosophy, Poetry, Psychology, Religion, Romance, Science, Science Fiction, Self Help, Suspense, Spirituality, Sports, Thriller, Travel, Young Adult,
       Répondre 
    Voulez-vous vraiment ?  Oui  Non
    Votre message apparaîtra ici

Ii. e. history of the earth

  1. 1. PLEDGE OF LEARNING 1. I can describe how layers of the rocks (stratified rocks) are formed; 2. I can describe the different methods (relative and absolute dating) to determine the age of stratified rocks;
  2. 2. PLEDGE OF LEARNING 3. I can explain how relative and absolute dating were used to determine and identify the subdivisions of the geologic time scale;
  3. 3. PLEDGE OF LEARNING 4. I can describe how marker fossils (also known as guide fossils) are used to define and identify subdivisions of the geologic time scale; and 5. I can describe how the Earth’s history can be interpreted from the geologic time scale.
  4. 4. Stratification of Rocks
  5. 5. Stratification • Crustal movement, displacement of soils, and distortion of terrains lead to layering of rocks • Sedimentary rocks form as sediments are deposited on the bottom of a body of water
  6. 6. Nicholas Steno (1638-1686) • In late 17th century, he introduced the principle of geologic timescale • Each layer of the rock could represent a “slice” of time.
  7. 7. How do geologists determine how old rocks are?
  8. 8. Dating Methods Relative Dating Absolute Dating
  9. 9. Relative dating • This method does not provide actual numerical dates for the rocks but all are just estimates based on the profile of the strata
  10. 10. PRINCIPLE OF RELATIVE DATING
  11. 11. Principle of Superposition • Rock layer above is younger than the ones below it. (Oldest on bottom, youngest on top)
  12. 12. Principle of Original Horizontality • Sedimentary layers are deposited in approximately horizontal sheets. • If layers are folded, episode of deformation must have occurred after rocks formed. Age of folding is younger than youngest deformed rock unit.
  13. 13. Principle of Crosscutting Relationships • Any feature (e.g. fault or intrusion) that cuts across rocks is younger than the youngest rock that is cut.
  14. 14. Relative Age Dating
  15. 15. Illustration of Relative Age Principles Superposition Cross Cutting RelationsOriginal Horizontality
  16. 16. Absolute dating • use radiometric dating techniques to determine how long ago the rock formed in the exact number of years
  17. 17. • Uses radioactive decay and the Half-life of certain elements • Half-life - time it takes for one- half of the radioactive material to decay
  18. 18. • Half-Life: the time it takes for 50% (1/2) of the nuclei in a radioactive sample to decay to its stable isotope • Multiply the number of half-lives by the half-life time to get the age of a fossil
  19. 19. • If the half-life of an isotope is 10,000 years and 3 half live have passed, what is the age of the fossil?
  20. 20. Radiometric dating Radioactive elements (isotopes) used for dating: • Carbon (C14) - Halflive: 5730 years • Potassium (K40) - Halflive: 1.25 billion years • Uranium (U235) - Halflive: 0.71 billion years • Thorium (Th 232) - Halflive: 14.1 billion years • Mainly igneous and metamorphic rocks contain Potassium, Uranium, Thorium • C14 method to date charcoal, shells, other organic materials carbon
  21. 21. 4.6 billion years old = 4,600,000,000 The Age of the Earth
  22. 22. The earth’s 4.6 billion year history is divided into major units of time: Cenozoic Era Mesozoic Era Paleozoic Era Precambrian Eon Phanerozoic Eon
  23. 23. Precambrian Eon • 4.6 billion years before present to 544 million years before present • Longest era with a sparse fossil record • Origin of earth’s crust, first atmosphere, and first seas
  24. 24. Precambrian Eon • Earliest fossils of cyanobacteria use photosynthesis to produce oxygen • Ozone layer in the atmosphere is formed from oxygen
  25. 25. Phanerozoic Eon
  26. 26. Paleozoic era (The Era of Old Life)
  27. 27. Paleozoic era • 544 million years before present to 245 million years before present • Marine communities flourish • Early fishes develop
  28. 28. Paleozoic era • Origin of amphibians, insects & reptiles • Recurring ice ages/ Appalachians mountains form • Spore-bearing plants dominate
  29. 29. Paleozoic era (continued)… • 286 - 248 million years before present: Supercontinent of Pangaea forms • 248 million years before present: MASS EXTINCTION-90 % of all known families lost! c
  30. 30. Mesozoic Era (The age of reptile)
  31. 31. Mesozoic Era • 245 million years before present - 65 million years before present • The age of the dinosaurs! • Gymnosperms dominate land plant/ origin of angiosperms - flowering plants
  32. 32. Mesozoic Era • Origin of mammals & birds • 145 million years before present - asteroid impact? MASS EXTINCTION • Pangaea begins to separate/ Rocky mountains form
  33. 33. 65 million years before present…. • ASTEROID IMPACT! • Mass extinction of ALL dinosaurs and many marine organisms • End of the Mesozoic era
  34. 34. Cenozoic Era • 65 million years before present -today • Present era we live in • Continued evolution and adaptations of flowering plants, insects, birds, mammals
  35. 35. Cenozoic Era (The age of mammals) “Era of recent life”
  36. 36. Cenozoic Era • Mammals dominant • Major crustal movements & mountain building (Alps & Himalayan mountains form)

×