aa
Rough volcanic rock
Aa is a type of lava with a rough, jagged surface formed by the hardening of viscous molten rock.
The word comes from Hawaiian and is used in geology to distinguish this blocky texture from smooth pahoehoe lava.
Pronounced as two syllables: AH-ah.
lava
Fine-grained volcanic stone
- volcanic rockCooled magma material
- lava flowMoving volcanic discharge
- rough textureUneven tactile quality
- HawaiianFrom the 50th state
basalt
Fine-grained volcanic stone
- volcanic rockCooled magma material
- lava flowMoving volcanic discharge
- rough textureUneven tactile quality
molten rock · Hawaiian · geology · volcanic
- aa batteries
- AAA batteryCompact cylindrical power cell
- AA batteryStandard small power cell
- AA meetingAddiction recovery gathering
- say aahThroat examination prompt
- AAA ratingHighest credit assessment