Essay Volcanoes

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Affects of Volcanoes
     The plates which are about 20 miles thick, make up the earth's crust and are a chief cause of volcanic activity. These plates are always in motion. They move very slowly, however some at times bump in to each other. These movements put a lot of pressure on the surface rock. Volcanoes obtain their energies from such movement and pressure. Volcanoes form at the boundaries of these plate where two types of movement occurs, two plates will collide with each other or the plates will move apart from each other. Some of these plates layers are cooled and are made up of rigid rocks.
     

     The affects on the landscape is lava that
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Also lava flow is more life threatening but can produce a lot of property damage as well as economic loss. Volcanic ash can collapse roofs and damage crops, especially if they become wet from rainfall. Debris flows called lahars that are mixtures of volcanic debris and water made from melted snow or ice or heavy rainfall. If anything comes in the path of lahar can destroy and also travel quickly through valleys.
     

     Indirect hazards are usually non volcanic effects that accompany or follow eruptions. Examples are rainfall-caused debris flow, and post eruption disease and famine. Tsunamis are large seismic sea waves generated by sudden movement of the seafloor. This sudden seafloor movement can be caused by a large earthquake or by the collapse of an island volcano during or after an eruption. Tsunamis can devastate low-lying coastal areas and can be deadly if people living in such areas are not evacuated. Indirect hazards also include volcanic deposits from large eruptions. These deposits can blanket farm fields and grazing lands, leading to the loss of crops and livestock and ultimately to the starvation of people dependent on them for life. During the period from the 17th century to the 19th century, tsunamis and posteruption starvation and disease caused most eruption-related deaths.
     Possible future activity can be noticed sometimes by predicting the next

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