1. May 31, 2016
Learning Target: I will know the characteristics of 3 types of volcanoes.
Entry Task:
Be ready for new seats
Earthquake test data & review
Agenda: 3 Volcano Types
Volcano Types – Notes

2. Earthquakes Quiz Data:
Class Quiz Average
1st – 23.96/32 = 74.88%
3rd – 23.60/32 = 73.75%
4th – 25.30/32 = 79.06%
6th – 23.67/32 = 73.97%
Class Overall Averages
1st – %
3rd – 77.90%
4th – 84.59%
6th %

3. Earthquakes Quiz Data:
A = B = C = D = E = ≥ 19

4. Earthquakes Quiz Data:
Grades:
Total Test Average Total Overall Average
(78 Students Tested) (104 Science Students)
75.42% %

5. Earthquakes Quiz Data:
1st Period Grade Distribution: 100% - 1 A – 1 B – 5 C – 9 D – 4 E – 3

6. Earthquakes Quiz Data:
3rd Period Grade Distribution: 100% - 0 A – 1 B – 5 C – 3 D – 4 E – 2

7. Earthquakes Quiz Data:
4th Period Grade Distribution: 100% - 0 A – 4 B – 7 C – 4 D – 4 E – 1

8. Earthquakes Quiz Data:
6th Period Grade Distribution: 100% - 0 A – 2 B – 5 C – 5 D – 7 E – 2

9. Overall Grade Distribution

10. Types of Volcanoes

11. Volcanoes: Introduction
Volcanism:
When magma reaches
surface
Eruptions of lava flows or
pyroclastic materials

12. Volcanoes: General Description
Cone-shaped mountain around a vent
Where lava, pyroclastics, gases erupt

13. Volcano: Vocab
Magma: Molten rock below Earth’s surface Lava: Molten rock on Earth’s surface Tehpra: Material ejected from a volcano Ash: particles less than 2mm Bombs: Extremely hot, partially melted large rocks – can explode on impact w/ground

14. Volcano Types: Shield Volcano Large, gently sloped volcanoes (5-10°)
Mostly lava flows; very little pyroclastics
Low viscosity lavas
Largest volcanoes on Earth
Ex: Mt. Kilauea

15. Composite Volcanoes (Stratovolcanoes)
Volcano Types:
Composite Volcanoes (Stratovolcanoes)
Smaller & steeper than shields; larger and gentler than cinder cones
Volcanic eruptions are usually explosive.
Alternating layers of ash and lava create a composite volcano
Composite volcanoes mostly occur at convergent boundaries (subduction zones)
Ex: Mt. Rainier (all Cascade volcanos)

16. Volcano Types:
Composite Volcano - Eruption

17. Volcano Types: Composite Volcano - Lahars
Volcanic mudflows
Muddy slurry; rain fall or snowmelt mixes with tephra

18. Volcano Types: Composite Volcano - Lahars

19. Volcano Types: Composite Volcano - Lahars
Mt. Rainier Lahar
Hazard Map

20. Volcano Types: Composite Volcano – Pyroclastic Flow
Hot ash, embers, and poisonous gas
Up to1000 degrees Celsius (1830 Ferinheit)
Moves very fast up to 450 mph

21. Volcano Types: Composite Volcano – Pyroclastic Flow
Has the ability to knock down trees and small buildings
Buries, burns, and destroys everything in its path on impact.
In 1902, Mount Pelee’s pyro-flow killed 30,000 people

22. Eruption could be felt and seen hundreds of miles away
Volcano Types: Composite Volcano – St. Helens
Photo taken early 1980
Eruption could be felt and seen hundreds of miles away
Present day

23. Volcano Types: Composite Volcano – St. Helens
This photo was taken 2 years after the eruption, this once great forest was still trying to recover
Car buried in mud 17 miles away from Mt. St. Helens
Escaping the ash on a beautiful afternoon in May
Hot ash covered everything and traveled hundreds of miles

24. Volcano Types: Composite Volcano – St. Helens

25. Volcano Types: Composite Volcano - Cascades

26. Volcano Types: Cinder Cone Volcano
Smallest. Has steep sides (30 degree slope) and is loosely packed
Explosive eruptions throw lava and bits of rock high into the air
Bits of rock or solidified lava dropped from the air are called cinders which range in size from ash to large rocks

27. Volcano Types: Cinder Cone Volcano - Sunset Crater

28. Cinder Cone Volcano - Paricutin
Volcano Types:
Cinder Cone Volcano - Paricutin
On February 20, 1943, Paricutin, a cinder cone volcano, formed from the crevasse in a cornfield and grew to be several hundred meters tall in just a few days. This volcano continued to erupt for 9 years and grew to be over 1300 feet tall.
This gave modern scientists the opportunity to witness the birth of a volcano