Volcanic Activity and Earthquakes
Natural hazards such as earthquakes and volcanoes have led to a substantial shaping of the earth’s surface as well as the environment over millions of years. According to Cusick (7), a volcano is an area where molten rock or magma from the earth’s crust reaches the surface of the earth becoming lava. Volcanic eruptions can be usually effusive and explosive according to the chemistry of the lava. This includes the amount of silica and dissolved gases in the lava. Thick lava has high silica levels while fluid lava has low silica levels. The higher the amount of dissolved gases ...
