• 7 Videos, Slides, Films

• 4 Historical geology
• 4 Internal structure
• 4 Plate tectonics
• 3 Methodology
• 3 Nationalism
• 3 Research
• 3 Slopes (Physical geography)
• 3 Sociology
• 3 Study and teaching
• 2 Volcanism
• 2 Volcanoes
• 1 Catastrophes (Geology)
• 1 Effect of environment on
• 1 Geology
• 1 Volcanic gases

• 3 BBC Worldwide Ltd
• 2 Infobase

• 7 English

• 4 Earth (Planet)
• 3 Europe
• 1 Hawaii
• 1 Iceland

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