1. Choanoflagellate biosilicification requires the concentration of silicic acid within the cell. 2. Rocks high in silica produce silicic acid as a weathering product. 3. The lava flow is unusually long for a silicic lava flow. 4. The magmas forming the volcano became more silicic over time. 5. Cerro Chao is the largest such silicic lava flow known. 6. Most volcanism in the area is of silicic nature however. 7. In addition, contact with eyes may form silicic acid with resultant irritation. 8. The volcano contains basaltic rocks with an extrusion formed from more silicic rock. 9. Lower mantle melt rates would form mafic melts that incorporate silicic melts before erupting. 10. The proposal was supported by an experiment involving volunteers and silicic -acid drinks.
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