Coordinated Science
Name _____________________________________
Date: _____________________
Period: _______
Mystery of the Megaflood
Answer the following questions about the video
1. The Channeled Scablands lie ________________________ east of Seattle.
2. What are some of the landforms that make this landscape different from the areas surrounding it?
3. There is evidence that the Columbia River flowed through the Scablands. True or False
4. The non-native __________________ boulders that included a 100-ton giant are scattered throughout
the area and are called “erratics”.
5. River erosion could not explain giant ____________________, and ice was too remote from the
Scablands to create these hanging ____________________.
6. Why was J. Harlen Bretz’s theory about the Scablands not initially accepted?
7. Missoula, Montana lies _________________________ east of the Scablands.
8. The glacier that came from ____________________ during the last Ice Age reached what is now
____________________.
(from where to where?)
9. The 520 cubic miles volume of water that backed up as a result of the ice is known as
__________________ ___________ _____________________.
10. The Icelandic Glacier is a massive 300 feet thick but is tiny in comparison to the glacier that formed
Glacial Lake Missoula, which was at least __________ times thicker.
11. How did the 1996 Icelandic flood provide evidence for the landforms in the Channeled Scablands?
12. What formed the strange potholes found in the Scablands region?
13. The water that rushed out of Glacial Lake Missoula traveled up to 60 mph and took only few
____________ to reach the Scablands.
14. What evidence do scientists have that the Channeled Scablands area has repeatedly been hit by huge
“megafloods” again and again?
Post-video:
15. Make a summary list of visual evidence that supports megafloods and/or large glaciers in
Washington’s past.
a. Use your list from # 14 above as a starting point.
b. In a few words make a note of how this evidence is linked to floods or glaciers
Visual evidence
Link to past climate / event