Mount Ontake in Japan erupted explosively with little warning. Prior to the eruption, magma had formed and remained underground for a period of time. Scientists investigated what crustal conditions may have contributed to the eruption style and timing. Choose the correct answer from each drop-down menu to complete the statements. In this setting, the continental crust was [Dropdown 1] , which created significant barriers to upward magma movement. Over time, [Dropdown 2] built up beneath the surface due to limited release pathways. When internal forces overcame crustal resistance, the eruption occurred via [Dropdown 3] .