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California
2
Field geology
2
Germany
2
Hawaii
2
Iceland
2
Igneous rocks
2
Italy
2
Lava dome
2
Magma
Mexico
New Zealand
2
Scoria cone
2
Sicily
2
Volcanic rocks
2
Volcanology
2
"Brazil nut effect"
1
Albuquerque
1
Alpine Texas
1
Andesite
1
Andesite dike
1
Arizona
1
Atlacomulco
1
Auckland
1
Augusta
1
B. G. J
1
Basalt
1
Basaltic dike
1
Belknap Crater
1
Big Bend National Park
1
Bilateral symmetry
1
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