That didn't really hold any water because around this area, there's no pyroclastics, there's no tephra, lava, volcanic rock, or anything like that. What we think it is now is what's called a ...

Tephra is a general term for fragments of volcanic rock and lava that are blasted into the air by explosions or carried upward by hot gases. Tephra includes large, dense chunks, light rock debris ...

Researchers from the DOST-Industrial Technology Development Institute (DOST-ITDI) studied tephra or rock fragments from the volcanic eruption. "Research and development are drivers of long-term ...