31. The larger cones produced more tephra , occasionally with lightning within the tephra cloud. 32. The larger cones produced more tephra, occasionally with lightning within the tephra cloud. 33. Tephra fell as far as from the volcano.34. The nearby village of Nelson Lagoon was coated with tephra during the powerful eruption. 35. Samples of the tephra were dense, insinuating that the lava released was mature. 36. The tephra accumulates in the vicinity of the vent, forming a cinder cone. 37. The calcium sulfate, anhydrite, was present as phenocrysts in the erupted tephra . 38. Explosive eruptions are characterized by gas-driven explosions that propels magma and tephra . 39. Their retreat left a series of lakes that caught tephra deposited by volcanic activity. 40. Explosively erupted pyroclastic material is called tephra and includes tuff, agglomerate and ignimbrite.
