HPT 101: Lesson 8: Ocean Trenches
In this lesson we learn the standard explanation for the ocean trenches (and the many problems with this explanation) then we learn the HPT explanation.
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VIDEOS:
Video 8A: Where are the trenches?
A 12-minute tour around the globe using Google Earth.
Video 8B: Standard theory of trenches and the problems with subduction (51 min,)
Template page to download and print: HPT101 8B template page
Video 8C: HPT answer to formation of trenches (31 min)
(No template page for this one.)
Video 8C snack idea: Ritz crackers with peanut butter. I will talk about how this simulates what happened to the floor of the Pacific Ocean.
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Suggested activities for this lesson:
Activity 8.1: Try the can crushing experiment
https://www.youtube.com/watch?v=qXclcimrmfI
Activity 8.2: VIDEO LAB: Watch me demonstrate what crossover depth is
Demo to watch: https://www.youtube.com/watch?v=TP4-Zw9DDsA
If you’d like to do this demo yourself, here are the instructions for how to make it:
Cross-over depth demonstration you can do at home
Activity 8.3: PAPER CRAFT PROJECT
Download and print the pattern onto regular weight card stock. Use regular paper if you can’t print on card stock. If you can’t print in color, go ahead and print in black and white.
3D paper model–problems with subduction
Activity 8.4
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SUGGESTED FOLLOW-UP ACTIVITIES for students using this course for credit:
READING: Pages 153-162 in the ITB flipbook.
The videos in this lesson have not addressed everything mentioned on these pages, but we’ve gone over enough that they should be readable. We will hit a few of these topics (melting the inner earth and how earth shrank) in future lessons, so you’ll get a preview on those.
