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5.Risks associated with geological activity:  5.1Seismic risk:-Rifts:are formed by divergent&transform boundaries.-Subduction zones:the convergent boundar are found next to the arcs of islands or continents.-Continental collision zones:the convergent boundaries are found in the interior of the continents.5.2Volcanic risk:the danger&violence of volcaic eruptions depend mostly on the viscosity of the magma&on the quantity of gases it contains-Main types of eruptions:-Hawaiian eruptions:the viscosity &gas content are very low-Vulcanian erup:the viscosity is intermediate-Plinian erup:viscosity&gas content are very high.

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