Presentation on theme: "8. Geologic Time Essential Question: How do rock layers and fossils provide a record of Earths geologic history & the evolution of life? Learning Target:"— Presentation transcript:
8. Geologic Time Essential Question: How do rock layers and fossils provide a record of Earths geologic history & the evolution of life? Learning Target: I can analyze how rock layers and fossils provide evidence of Earths history Learning Task: I will interpret data and draw conclusions for rock layers. I will correctly sort Geologic Vocab. I will understand how fossils show Earths continents movements.
Welcome! Warm Up Wednesday 4/10/13 Week of 4/7 – 4/11 What is an index fossil? How are they important to relative dating?
Table Talk 1. What is relative dating? 2. Can it tell us the exact age of a fossil? 3. Why is it useful?
4 th Quarter Table of Contents 1 TitleAssignment # Ice Cores2 Ice Core Webquest3 Fossil Notes4 Getting into the Fossil Record 5 Fossil Vocab6 Fossils over Time (Molds vs Casts) 7 Law of Superposition Vocab 8 Whos on First? (Wkst)9 Geologic Time VOCAB 10
Law of Superposition VOCAB 8 Law of superposition – the idea that rocks and fossils found in lower layers are older than the rocks and fossils found in the top layers relative dating – a method of dating rocks which cant give us an actual age, but can tell us whether a rock layer is older or younger than another strata – a certain rock layer unconformity - gaps in rock layers and/or the fossil record intrusion - a rock layer that forms when magma hardens beneath Earths surface extrusion - a rock layer that forms when lava flows onto Earths surface and hardens radiometric dating – using radioactive elements found naturally in substances in order to determine how old they are. absolute age – the actual age of a rock or fossil
Extension: Google Drive: 8.Finding Clues to Rock Layers Skills Lab Wkst Complete the Skills Lab in our book on page 330, and answer Site 1 (#2, 3, 4 & 5) Site 2 (#6, 7, &8)
Geologic Time VOCAB 10 Obtain a set of vocab cards from your teacher Match the correct definition to each vocab word Check with your teacher that you are correct Record your vocab on page 10 in your Lab Notebook
Geologic Time Vocab10 Geologic Time Scales - a record of the life forms and geologic events in Earths history Era - a unit of geologic time that includes two or more periods Period - a subdivision of an era Continental Drift - the theory that states that the gradual shifting of Earths plates causes continents to move over time Pangaea - The name of the big landmass that broke apart into the current continents Plate Tectonics - large pieces of the Earths outermost layer (called tectonic plates) move and change shape