A hollow cylinder or tube like underground formation of solid lava
A hollow cylinder or tube like underground formation of solid lava
A volcanic bomb is a chunk of ejected viscous lava larger than a lapilli, being over 64 mm.
Molten volcanic rock, still in a hot viscous state and not yet solid
A blue semi precious stone, frequently used in jewelry for at least 3,500 years
Small volcanic ejections of solid lava which range from 2 and 64 millimeters in size
Pertaining to the cutting, polishing, carving or setting of precious or semi-precious stones
The mass movement of loose alluvial debris, usually on a steep gradient
A satellite which provides landscapes imagery including patterns, geologic structures
An igneous sedimentary rock, composed of altered mafic and ultramafic minerals
A term used to describe the arrangement of leaves or sheets in a structure, sometimes bound on a side