santorini_g5651.jpg (Photo: Tom Pfeiffer)
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Igneous or magmatic rocks
: The most primitive rock type forms when magma (molten rock) solidifies - either inside the earth (plutonic rocks) or during volcanic eruptions (volcanic rocks). A short overview.
Glossary of geologic terms
: A growing list of often illustrated explanations and definitions of geological terms and keywords, with focus on volcanology and seismology.
Colima volcano photos
: This beautiful stratovolcano in western Mexico is one of the most active volcanoes on the American continents. It is known for its often spectacular explosions and sometimes glowing avalanches.