The document summarizes key information about plate tectonics, including that the Earth's crust is broken into plates that move slowly over time, which causes earthquakes and volcanoes to occur at plate boundaries. It also lists the names and locations of some of the world's most active volcanoes.

1. Unit 1 Restless Earth
Structure of the earth
Location of plates
Distribution of Earthquakes
Distribution of Volcanoes

2. Cross section of the Earth

3. Plate names

4. Key Points
• The Earth’s crust is broken into several plates (a bit
like the cracked shell of a boiled egg).
• Convection currents cause these plates to move
about very slowly (a few cm per year).
• Earthquakes and volcanoes occur at the edges of
these plates (PLATE BOUNDARIES).

5. World Volcanoes
1. Heimaey 11. Krakatoa
2. Surtsey 12. Mayon
3. Vesuvius 13. Pinatubo
4. Etna 14. Fuji
5. Mt St Helens 15. Unzen
6. Popocatapetl 16. Ngaurahoe
7. Paricutin 17. Kilauea
8. Cotopaxi 18. Mauna Loa
9. Chimborazo 19. Tristan da Cunha
10. Aconcagua 20. Katmai

6. 1
2
20
5 3
14
4
18 6 15
7 12
17 13
8
9 11
10
19
16
Volcanoes are found in lines. They are along the edge of
plates in most cases.

7. Plate definitions