31. The longest currently ongoing ( but not necessarily continuous ) volcanic eruptive phases are: 32. Mount Shasta has an explosive, eruptive history. 33. Arenal has several eruptive vents . stratovolcanic cone. 34. This eruptive phase also produced a lava dome that comprises the current high pinnacle. 35. Quizapu Crater grew slightly during this eruptive period. 36. It has been considered that they became trapped during transport in the eruptive plume. 37. They are intrusive in the Paleozoic strata but older than the Tertiary eruptive rocks. 38. Several stages of eruptive activity are recognized, some of them exposed through erosion. 39. Small lava flows from some vents beneath the scoria are the last eruptive activity. 40. It's mostly just about the deposition of the eruptive products and stratigraphy.
