Volcanoes are formed when magma travels through the earth's mantle and crust, emerging as lava on the surface where it hardens into mountains. The main components of volcanoes are lava and ash. Most volcanoes are located near tectonic plate boundaries under the oceans. There are four main types of volcanoes that differ in shape. Volcanic eruptions can be triggered by pressure from gases, chemical reactions, or new magma injections. Eruptions expel lava, gas, and ash, which can block the sun for years and destroy nearby towns.

1. Volcanoes: What They are and How They WorkPresentation By Justin Ventline

2. AgendaHow They are Formed

3. What the are made of

4. Where they are located

5. Different types

6. What triggers an eruption

7. What happens during an eruption

8. The AftermathHow They are FormedMagma makes it way through the upper mantle to the earths surface.How They Are FormedOnce the magma makes it to the surface it is called lava, and the lava collects around the earths opening forming a mountain type shapeWhat They are Made OfOnce the lava cools in a mountain shape a young volcano has formed.

9. Also, the ash and rock that is moved will help form the volcanoWhat They are Made OfLavaAsh & Rock

10. Where they are locatedMost volcanoes are found on the shores of oceans or seas where the earths plates are either colliding or separatingWhere They are LocatedA very famous string of volcanoes is called the “Ring of Fire”

11. The red dots or lines are once active or currently active volcanoes

12. Contains 452 volcanoes and over 75% of the worlds active volcanoesThe RingOfFire

13. Different Types There are 4 Types of Volcanoes

14. Cinder Cones

15. Composite

16. Shield