Thursday October 23, 2014

LTLT: I can identify and analyze data to describe how major geologic events have changed organisms over time. LT: I can describe the law of superposition LT: I can describe absolute and relative dating. Criteria for Success: I can identify the ages of rock layers I can order rock layers, based on age.     Warm up:  Q: How can we tell how old someone/something is? *Make a list on the board… Share LTLT, LT & CS Table talk Q: how can we find the age of a rock? Q: Can we use our list of indicators?? *Hand out rocks…. Look at the fossil/rock in front of you, how old do you think it is, and why? We’ve talked about extinctions…how can knowing the age of the rocks around a found fossil help us determine when the organism was alive, and how old it is? Agenda: 1.     Warm up 2.     Table Talk 3.     Law of Superposition Pwr. Pt & notes 4.     Activity #1 5.     Activity #2 6.     Checking for understanding 7.     Debrief 8. Exit Ticket                                                   Law of Superposition…  Power point On notecatcher…   Activity #1 Students practice gaining information on cross –sections using index cards with various fossils on them. *go over answers with them…. Activity #2 Students practice identify rock ages, using index cards, based on different principles.    Debrief:                               Review Answers from cards, activity #2 Q: Why do we need to know how old rocks are?? Q: How can we figure out how old fossils are? Q: How can knowing the age(s) of rocks help us learn about the area? Exit Ticke  Q: What is the law of Superposition? Q: What type of fossil helps us establish the age of rock layers? Q: HOW do index fossils help us establish the age of rock layers? Check for understanding * Share with your shoulder partner—how does all this relate to the fossils we will be finding in McCoy next week? Notecatcher LT: I can describe the law of superposition The Law of Superposition A Fossil is _________________________________________ The Law of Superposition             Younger rocks lie above older rocks if the ­­­­­­­­­­ ___________________________________ Index Fossils             A fossil that is found in the rock layers of only ­­­­­______________________and is used to establish the age of the ­­­­­­­­­­­­­­­­­______________________ LT: I can describe absolute and relative dating. Absolute & Relative Age Relative Age: The age of a rock compared to _____________________________________________________ Absolute Age: The number of years since ­­­­­­­__________________________________________________ Relative Age Dating:             Places geologic events ______________________________________________________ Carbon 14 Dating             Carbon 14 and ________________________________ are found in ________________________________________________________________________________________. When plants and animals die, the amount of Carbon-14 and Potassium-40 dies or decays at a __________________________________ letting scientists know how ____________ _____________________________________________________________________________________________.    Activity #1 —  On your desk, you have 8 large index cards with letters representing fossils —  placed on them. —  Your task is to determine what the correct sequence of the letter/fossils are. —  You have two clues: 1.     The card with the letters “C” and “T” is on the bottom, or the oldest layer 2.     Look for a card that has either a “T” or “C” written on it for the second layer. Write what order you think they should be here. Youngest: Oldest: What letter is the oldest? 2.     What letter is the youngest? 3.     What letter showed up the most? Which letters only showed up once? Which letters could be index fossils? How did you know which was older: “M” or “X”?   Activity # 2 You will study the rocks and events in a geologic cross section (strata) and put them in the correct order from oldest to youngest. (Generally bottom to top) There are 8 index cards you will be working with. Class Practice: Card #1 Order of rock layers: (oldest)__________, ___________, ____________, __________ (youngest)  Card #2 Order of rock layers:             (oldest) ________, ________, __________, __________, __________, _________ (youngest) Do the rest on your own, and record the card #, and the order of the rock layers, from oldest to youngest.   Law of Superposition Exit Ticket  Name: ___________________ Date: ____________ Class Period: _____________ LT: I can describe the law of superposition                  LT: I can describe absolute and relative dating. Q: What is the law of Superposition? Q: What type of fossil helps us establish the age of rock layers?  Q: HOW do index fossils help us establish the age of rock layers?