1. September 15, 2017
LT: I can describe how a volcano works.
No BBC today
TODAY:
1. Notes over volcanoes.—Copy all red in notebook “NOTES”
2. Watch Mt. St. Helens video and copy this question and answer this in your “NOTES” section of notebook:
What would I do if I lived near a place where a volcano could erupt? (ex: evacuate, stay, watch, use an underground bunker) and explain why you would do that.

3. VOLCANIC ERUPTIONS
Volcanic eruptions- usually occur near plate boundaries... on land or sea (notice next slide)
LAVA (molten rock) - pushes up through the Earth's crust at a weak point ... the lava solidifies and builds up to form mts. / volcanoes.
A. Mount Rainier, Washington 14,410
B. Mount Hood, Oregon ,249
C. Mount St. Helens, Washington ,365
D. Lassen Peak ,457
E. Mount Fuji, Japan ,388
F. Harney Peak ,244

5. Cascade Range-WA/OR/CA

7. The Columbia River crosses the Cascade Range and flows into the Pacific Ocean.

8. Mount Rainier, the highest mountain in the Cascade Range- 14,410 feet
Mount Rainier, the highest mountain in the Cascade Range- 14,410 feet. Seen in the background (left to right) are Mount Adams, the peak of Mount Hood, and Mount St. Helens.

9. Mt. Rainier (WA) 14,410

10. Mt. Hood—11,249’ Oregon’s highest peak

11. Mt. Hood reflected in Mirror Lake

12. Mt. St. Helens—9,600’ (Before the eruption)

13. After the eruption—8,365’

15. Lassen Peak—only other volcano in N.A. to erupt (1917)

16. Lassen Peak, CA 10,457’

17. Mt. Fuji—12,388’

18. Harney Peak—7,244

19. VOLCANIC ERUPTIONS " RING OF FIRE " ( pg. 49 )
area outlines the Pacific Ocean
volatile area with a high degree of earthquakes and volcanic eruptions...
activity the result of Pacific plate in a constant state of motion (grinding / colliding)

21. Side vent—this blew
out at Mt. St. Helens
Typical volcanic
Eruption--vertical

22. Mt. St. Helens—
Lateral Eruption
Atypical—was not
expected nor predicted.

23. A Forest Flattened

24. The Deadly LaHar

25. Ash layers after the eruption