Presentation on theme: "8. Geologic Time Essential Question: How do rock layers and fossils provide a record of Earth’s geologic history & the evolution of life? Learning Target:"— Presentation transcript:
18. Geologic TimeEssential Question: How do rock layers and fossils provide a record of Earth’s geologic history & the evolution of life?Learning Target: I can analyze how rock layers and fossils provide evidence of Earth’s historyLearning Task: I will interpret data and draw conclusions for rock layers.I will correctly sort Geologic Vocab.I will understand how fossils show Earth’s continents movements.
2Welcome! Warm Up Wednesday 4/10/13 Week of 4/7 – 4/11 What is an index fossil?How are they important to relative dating?
4Table Talk 1. What is relative dating? 2. Can it tell us the exact age of a fossil?3. Why is it useful?
54th Quarter Table of Contents 1 Title Assignment #Ice CoresIce Core Webquest 3Fossil NotesGetting into the Fossil Record 5Fossil VocabFossils over Time (Molds vs Casts) 7Law of Superposition Vocab 8Who’s on First? (Wkst) 9Geologic Time VOCAB
6Law 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 layersrelative dating – a method of dating rocks which can’t give us an actual age, but can tell us whether a rock layer is older or younger than anotherstrata – a certain rock layerunconformity - gaps in rock layers and/or the fossil recordintrusion - a rock layer that forms when magma hardens beneath Earth’s surfaceextrusion - a rock layer that forms when lava flows onto Earth’s surface and hardensradiometric 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
7Extension:Google Drive: 8.Finding Clues to Rock Layers Skills Lab WkstComplete the Skills Lab in our book on page 330, and answerSite 1 (#2, 3, 4 & 5)Site 2 (#6, 7, &8)
8Geologic Time VOCAB 10 Obtain a set of vocab cards from your teacher Match the correct definition to each vocab wordCheck with your teacher that you are correctRecord your vocab on page 10 in your Lab Notebook
9Geologic Time Vocab 10Geologic Time Scales - a record of the life forms and geologic events in Earth’s historyEra - a unit of geologic time that includes two or more periodsPeriod - a subdivision of an eraContinental Drift - the theory that states that the gradual shifting of Earth’s plates causes continents to move over timePangaea - The name of the big landmass that broke apart into the current continentsPlate Tectonics - large pieces of the Earth’s outermost layer (called tectonic plates) move and change shape
10Geologic Time Webquest ucation/explorations/tours/stories/ middle/intro.html
11Exit TicketWhich period in Earth’s history would you most like to time-travel to? Why?