1. How does a volcano erupt?
VOLCANOES
How does a volcano erupt?
VOLCANIC LANDFORMATIONS
VOLCANOES AND PLATE TECTONICS
VOLCANIC ERUPTIONS

2. RING OF FIRE
One major belt of volcanoes. It includes the many volcanoes that rim the Pacific Ocean.

3. ISLAND ARC
Many volcanoes form near converging plate boundaries, where two oceanic plates collide.
Sometimes these volcanoes create a string of islands called an island arc.
Volcanoes also occur where an oceanic plate is subducted beneath a continental plate.

4. ISLAND ARC

5. HOT SPOT

6. FORMATION OF A VOLCANO

7. SUBDUCTION

8. SHIELD VOLCANO

9. CINDER-CONE VOLCANO

10. COMPOSITE VOLCANO:Cotopaxi

11. Dormant Volcano. Cayambe

12. Island Formation. Plume Volcanism

13. Type of Lava: Pahoehoe

14. Type of Lava: Aa

15. Types of Lava: Aa
Aa flows are emitted from the vent at high rates ranging to 50km an hour, often with much lava fountaining. They are characteristic of viscous magmas.
Aa flows are animated with sporadic bursts of energy. They may push down houses, walls and forests. However, the hallmark of aa lava flows is the very rough surface it produces when it cools and solidifies.

16. Lava explosion hits the water in Hawaii

17. Pyroclastic Flow

18. Pyroclastic Flow

19. Volcanic Landformations:Caldera

20. Lava Plateau. Stromboli. Italy.

21. Crater. Erta Ale. Ethiopia

22. Erta Ale. Ethiopia

23. Parts of a Volcano

24. Parts of a Volcano

25. Volcanic Neck
Magma hardens in a volcano’s pipe and the surrounding rock later wears away.

26. Volcanic Neck

27. Dikes
Magma that forces itself across rock layers and hardens.

28. Dike

29. Sills
Magma that squeezes between horizontal rock layers and hardens.

30. Dome Mountains
Forms when uplift pushes a large body of hardened magma towards the surface, which eventually will become expose.

31. Dome Mountains

32. Batholiths
Mass of rock form when a large body of magma cools inside the crust. Igneous intrusive ( plutonic)

33. Batholiths