1. Date:
Entry:
Volcanoes Pg

2. 1. Volcanic eruptions Constructive force
I. Add new rock to existing land
II. Make new islands
B. Destructive force
I. Changes landscape around the volcano

3. Mount Saint Helens

4. Mount Saint Helens

5. When Mt. St. Helens erupted.

6. 2. Anatomy of a volcano
Vent – opening that allows magma to escape
Magma – melted rock inside volcano
Lava – erupted magma outside volcano
Volcano – the vent and the mountain that forms around it from cooled lava, ash, cinders, and rock

8. 3. Location of volcanoes Most occur along plate boundaries
Area in Pacific Ocean where volcanoes are common called Ring of Fire

10. C. Hot spots Form in the center of moving plates
Example – Hawaiian Islands, Yellowstone

11. For your viewing pleasure
Volcanic Eruption’s

12. Mt. St Helens

15. Two years after the 1980 eruption

16. Pahoehoe flow

17. Ropey Pahoehoe

18. Aa lava flow

19. Lava fountain

20. Lava meets ocean

21. Vulcanologists sampling gases

23. Mount Pinatubo ash plume

24. Dormant 500 years
July 16, eq.
April 1991 magma started rising to surface
1000s small eqs accrued
June 15th massive eruption ejected 5 cu.km vol. Material
Ash cloud rose 22 miles
Satellites tracked ash cloud several times around globe
Pyroclastic flows filled valleys 660 ft. thick
20 million tons of sulphur dioxide into stratosphere global temps dropped .50C.

25. Ex. Mauna Ulu, Hawaii

26. Mauna Loa, Hawaii erupting 1984

27. Mount Etna, Italy

28. Mount Rainer, Washington

29. Crater Lake, Oregon

30. Aniakchak Volcano, Alaska

31. Devil’s Tower, South Dakota
                                      

33. Clingman’s Dome, Great Smoky Mountain National Park, Tennessee