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Major Topics and Objectives 
5A.  GAIA THEORY

What caused our atmosphere to form?
Dr. James Lovelock (5 minutes)

5B.  GEOLOGIC EVENTS
How can the order in which geologic events occur be determined?

5C.  CORRELATION TECHNIQUES
How can rocks and geologic events in one place be matched with other locations?

5D.  DETERMINING GEOLOGIC AGES
How can Earth’s geologic history be sequenced from the fossil and rock record?
Geologic History in 5 1/2 minutes

5E.  RADIOACTIVE DECAY
How can the absolute age of a rock be determined?
Lecture 5E  Video Lesson: Radioactive Decay and Halflife
Study Questions   Pre-Lab Worksheet E Half-life Video Worksheet

5F.  THE FOSSIL RECORD
How can the rock record and fossil evidence reveal changes in past life and ancient environments?

Unit 5 Geologic History Links:
The Day the Mesozoic Died Video
Blue Planet IMAX (NASA)

Laboratory Investigations
Laboratory 5-1 Gaia Theory
Laboratory 5-2 Sequence of Events
Laboratory 5-3 Matching the Rock Layers
Laboratory 5-4 Geologic Time
Laboratory 5-5 Radioactive Decay
Laboratory 5-6 Reconstructing Past Events & Environments

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