1. Lesson 4
volcanoes & different
volcanic activities

2. Turn your book
on page 335!!!!!!

3. Volcano
• Is an opening in the earth’s crust where lava, pyroclasts, and
gases are ejected onto the surface during eruptions.

4. • Calderas – that exceed about 1 km in diameter
• formed when the summit of volcano collapses during
eruptions.

5. Kinds of volcano
•Shield volcano
•Cinder cone volcano
•Composite volcano or
stratovolcano

6. Shield volcano

7. The largest shield volcano

8. Cinder cone volcano
• Is built almost entirely of loose
fragments called CINDERS

9. Composite volcano

10. According to activity
• Active
• Dormant
• Extinct

11. Volcanic eruptions
• Explosive or violent eruption
• Quiet or non – explosive eruption

12. Thank you!!!