volcan (2) chimie (2) composition chimique (2) Chemical warfare (2) Antiquities, Prehistoric (2) Obsidian (2) Prehistoric peoples (2) Chemistry (2) Buildings (2) Sources (2) Sources (2)
village (1) science (1) roche (1) carte (1) histoire (1) champ (1) âge (1) Preservation (1) Context (1) History (1) Composition (1) Area (1) Maps (1) Observations (1) Observations (1) Maps (1) Area (1) Origin (1) Will (1) Volcanic ash, tuff, etc (1) Units of measurement (1) Tops (1) Series (1) Science (1) Ultrabasic rocks (1) Sedimentary rocks (1) Rocks (1) Primaries (1) Pegmatites (1) Ophiolites (1)