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Basalt
California
4
Tenerife
4
Etna
3
Field geology
3
France
3
Hawaii
3
Iceland
3
Idaho
3
Igneous rocks
3
New Mexico
3
New Zealand
3
Oregon
3
Viscosity
3
Volcanic rocks
3
Volcanology
3
Andesite
2
Arizona
2
Canary Islands
2
Cape Verdes
2
Crater
2
Craters of the Moon
2
Field photography
2
Italy
2
Japan
2
Lava flow
2
Lava tube
2
Magma
2
Mauna Ulu
2
Mexico City
2
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