This document discusses different types of volcanic eruptions: 1) Phreatic eruptions are driven by explosive expanding steam from surface water contacting hot rock. 2) Phreatomagmatic eruptions are characterized by explosive water-magma interaction that releases large amounts of steam and gases. 3) Strombolian eruptions are driven by bursting gas bubbles in magma and are relatively passive at the vent. 4) Vulcanian eruptions involve violent, noisy explosions lasting minutes to hours that eject bombs and blocks. 5) Plinian eruptions are the most explosive and powerful, forming tall columns of tephra and gas into the stratosphere

1. Grade 9: Earth and
Space Science
“Volcanoes”

2. Check Point
Let’s check your
understanding through
ANAGRAM

3. TRIAL!!!
E C O N

4. RAISE !!!
CONE

5. Let’s Begin the game!!! 
S T A P L E

6. RAISE !!!
PLATES

7. I COME STOP

8. RAISE !!!
COMPOSITE

9. SHE LID

10. RAISE !!!
SHIELD

11. CARTER

12. RAISE !!!
CRATER

13. ICE VAT

14. RAISE !!!
ACTIVE

15. TIC NEXT

16. RAISE !!!
EXTINCT

17. NO VOCAL

18. RAISE !!!
VOLCANO

19. HAS

20. RAISE !!!
ASH

21. GAMMA

22. RAISE !!!
MAGMA

23. SAGES

24. RAISE !!!
GASES

25. Activity Time!!!
  

26. Activity 1
“Familiarize
with me”

27. TYPES OF VOLCANIC ERUPTION
1.Phreatic
2.Phreatomagmatic
3.Strombolian
4.Vulcanian
5.Plinian

28. PHREATIC

30. Phreatic
-Hydrothermal or Steam-Blast
-driven by explosive expanding
steam resulting from surface water
coming into contact with hot rock
-triggered by earthquakes
-onset/beginning of a larger
eruption

31. PHREATO-
MAGMATIC

33. Phreatomagmatic
-Characterized by explosive water-
magma interaction through which
large amounts of steam and
magmatic gases are released

34. STROMBOLIAN

36. Strombolian
-driven by the bursting of gas
bubbles within the magma. When
this bubbles reach the surface, they
burst with loud pop mainly because
of the difference in air pressure
inside and outside the volcano

37. Strombolian
-relatively passive and non-
damaging to its source vent

38. VULCANIAN

40. Vulcanian
-characterized by tall eruption
Involves a series of violent, noisy
and short-lived explosions lasting
from few minutes to few hours
accompanied by the ejection of
volcanic bombs and blocks

41. PLINIAN

43. Plinian
-most explosive and most powerful
-features large explosive vents that
form enormous dark columns of
tephra and gas high into the
stratosphere

44. Plinian
-most dangerous features are the
pyroclastic flows produced by material
collapse which landslide along the side
of the mountain at a very high speed
(700kph)

45. What are the
positive and
negative impacts of
volcanic eruption?

46. Let’s Apply!!!

47. Check Point