1) Aa and pahoehoe 2) Aa and pahoehoe, for two 3) Basalt sources 4) Exudations from eruptions 5) Flowing rocks 6) Hot rocks 7) Liquefied rocks 8) Molten flows 9) Molten outpourings 10) Molten rocks 11) Outputs from el chichón 12) Pahoehoe and aa 13) Pumice sources 14) Scoria and aa 15) They go with the flow 
Classification: People: By nationality: American: By state: Illinois ...