220 221 7 th Grade Agenda Learning Objective
2/20 & 2/21 - 7 th Grade Agenda üLearning Objective: Discuss how radioactive dating can be used to date the age of rocks. üCollect HW: Reading & Notetaking p. 135 – 138 üChange Jobs üMeasuring Liquid Volume Lab üVideo: Walking w/ Monsters before Dinosaurs üHW: Review & Reinforce p. 95 & 98 üReminder Science Fair Board due 2/25 & 2/26(50 Points)
Reflection • Prompt: How can scientists know whether a rock is older than another rock?
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Science Fair Project due 2/25 & 2/26 (50 Points)
Science Fair Project Due 2/25 & 2/26 (50 Points) Title: 3 points Question: 3 Points Hypothesis : 3 Points Background: 3 Points Materials: 3 Points Procedures: 3 Points Data Table: 3 Points Graph: 3 Points Bibliography: 2 Points Results: 3 points Discussion: 3 Points Conclusion : 3 Points Display Decoration: 5 Challenging: 5 Points Scientific Validity: 5
What is an index fossil? • Index fossils help geologists match rock layer • To be useful as an index fossil, a fossil must be widely distributed and represent a type of organism that existed only briefly.
Which fossils are index fossils ? Trilobite Ammonite
These rocks are some of the oldest fossils in the world. How old are they? • Stromatolites: Remains of ocean reefs created by bacteria more than 3 billion years ago.
What is Radioactive Decay? • Radioactive Decay: over time, unstable elements break down or decay by releasing particles and energy.
What is half-life? • The half-life of a radioactive element is the time it takes for half of the radioactive atoms to decay.
If Geologic time went by in a single day, when did humans first appear? Humans first appear one second before midnight
Geological Time Scale • Paleozoic: Paleo means ancient or early • Mesozoic: Meso means middle • Cenozoic: Ceno means recent
Reflection • Prompt: Write 5 facts that you learned from the video.
- Slides: 13