Slide 1

Do Now You do not have to write the questions. Make a list of 5 people you know (mother, father, siblings, cousins, friends) and put them in order by age from youngest to oldest. Slide 2 Graphic Organizer Relative Age of Rocks http://www.youtube.com/watch?v=Ak-G_yfnmfI Slide 3 Vocabulary Foldable Slide 4 1. Relative Dating Slide 5 Do Now Discussion Slide 6 Comparing the age of one rock to the ages of other rocks Slide 7 Slide 8 2. Principle of Superposition Slide 9 Youngest Middle Oldest The rock layers on the bottom are oldest and rock layers on the top are youngest. http://faculty.icc.edu/easc111lab/labs/labf/oldest_layer/oldest_youngestlayers.html Slide 10 Slide 11 3. Anticline Slide 12 an arch of rock arranged in layers that bend downward in opposite directions from the top Slide 13 Review Slide 14 Slide 15 4. Faults Slide 16 Is a break in Earths crust. It is always younger than the rock it cuts through. Slide 17 Review Slide 18 Slide 19 5. Intrusion Slide 20 Magma that pushes into layers of rocks, then cools and hardens. It is always younger than the rock layers around and beneath it. Slide 21 Slide 22 6. Extrusion Slide 23 Lava that hardens on the surface. It is always younger than the rock layers beneath it. Slide 24 Slide 25 Slide 26 6. Extrusion Slide 27 Lava that hardens on the surface. It is always younger than the rock layers beneath it. Slide 28 Independent Practice Slide 29 Exit Ticket How do geologist use the principle of superposition to determine the relative age of rocks? Slide 30 RELATIVE AGE OF ROCK LAYERS DAY 2 Slide 31 Do Now You do not have to write the questions. What is the principle of superposition? What is a fault? Slide 32 Slide 33 Slide 34 Rock Layer Review Slide 35 Slide 36 http://www.classzone.com/books/earth_science/terc/content/investigations/es2903/e s2903page04.cfm Slide 37 7. Law of Original Horizontality Slide 38 States that rock layers are deposited in horizontal layers. If the rocks are tilted or folded, they have been deformed after deposition. Slide 39 http://www.classzone.com/books/earth_science/terc/content/visualizations/es2902/es2902p age01.cfm Slide 40 8. Unconformity Slide 41 Are gaps in the geologic record that show where some rock layers have been lost because of erosion Slide 42 4-Step Unconformity Process Sedimentary rocks form in horizontal layers. Folding tilts the rock layers. The surface is eroded. New sediment is deposited, forming rock layers above the unconformity. Slide 43 Slide 44 Slide 45 Slide 46 9. Index Fossils Slide 47 Help geologist tell the relative ages of rocks and what the environment was like. Slide 48 What can index fossils tell us about the environment? A fossil of a bird is found in layer E and a fossil of a fish is found in layer D. What happened? A dinosaur bone and a dragonfly fossil is found in layer C. What happened? A sea shell fossil is found layer B. What happened? Slide 49 Cut Foldable Slide 50 Independent Practice Slide 51 Slide 52 Exit Ticket Describe the unconformity process. What do index fossils tell us about the environment? Slide 53 ACT Prep Betty is shorter than Sally. Cynthia is taller than Sally. Carla is shorter than Betty. Is Sally shorter or taller than Carla?