GSC 106 Study Guide - Final Guide: Convergent Boundary, Pyroclastic Flow, Volcanic Ash
8 Sep 2018
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Document Summary
Volcanoes at convergent plate boundaries occur along the. These earthquakes are generally large: hot spots (hawaii)- a hole in the earth"s crust that allows lava to surface and layer. Over millions of years, these layers from mountains of volcanic rock that eventually break the surface of the pacific ocean, forming islands. Plate slowly moves over the hot spot, new islands are formed: relationship between source/viscosity/composition/behavior, pahoehoe lava-basaltic lava that cools down forming typical smooth, billowy, or ropt surfaces. Often it forms by many small breakouts of lava from an over- crusted inflating flat, irregular flow: aa lava- lava flows that cools down forming fragmented, rough, sometimes spiny or blocky surfaces. Glows down from a volcano, typically along a river valley: jokulhlaup- sudden, violent and short-lived increase in discharge of glacial meltwater. Volcanic hazards can be reduced through public awareness, planning laws, evacuation plans, hazard and risk mapping. Preparing through public information, volcano monitoring, delimit safe and danger zones.
