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Lava Essay Topics & Paper Examples

With reference to two volcanic events that you have studied from contrasting areas of the world, compare the nature of the volcanic hazard and its impact

With reference to two volcanic events that you have studied from contrasting areas of the world, compare the nature of the volcanic hazard and its impact. Mount St Helens erupted on the 18th May 1980 at 9am and is an active strata volcano Washington State USA, a MEDC. Where as on 18th July 1995, during the daytime, Montserrat, a LEDC during the day, Montserrat’s Soufrière Hills composite volcano of a height 1050m, meaning sulphur hills, dormant for centuries, erupted and produced a phreatic eruption. The volcano is a strata volcano also.Mount St. Helens is a composite volcano which lies near to a destructive plate boundary where the small Juan de Fuca Plate is being subducted underneath the North American Plate…

Intrusive and minor extrusive features of vulcanicity

Intrusive: Batholith: A large emplacement of igneous plutonic rock, formed by magma cooling deep in the Earth’s crust. Buoyant magma pushes up through the country rock, partially melting it, and then cools. A good example is the Cornubian batholith in south-west England, which has broken through the surface to form the well-known granite structures of Dartmoor and Bodmin moor, among others. Sill: A tabular sheet intrusion where magma has intruded between older layers of sedimentary rock, beds of volcanic lava or tuff, or even along the direction of foliation in metamorphic rock. Good examples are the Salisbury crags in Edinburgh, which are formed by a sill partially exposed by the ice age. Dyke: Similar to a sill, except the lava…