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Nature of vulcanicity and its relation to plate tectonics Flashcards Preview
Variations in the type and frequency of volcanic activity in relation to types of plate margin and types of lava. Forms of intrusive activity — dykes, sills, batholiths. The above paragraph has been added. Minor forms of extrusive activity — geysers, hot springs and boiling mud. Major forms of extrusive activity — types of volcanoes. Two case studies of recent ideally within the last 30 years volcanic events should be undertaken from contrasting areas of the world.
HKDSE Geography/M1/Intrusive Vulcanicity
Template:Simp Vulcanicity also known as volcanic activity or igneous activity is one of the endogenetic processes. Magma under the crust is under very great pressure. When folding and faulting occur, cracks or fractures which are lines of weakness are created. When ase lines of weakness develop downward in the crust and reach the magma, ay will release the pressure in the magma. This allows magma to rise up along the lines of weakness and intrude into the crust. Some magma may even reach the earth's surface.
A2 Geography: Plate Tectonics and Associated Hazards: Vulcanicity
Intrusive vulcanicity occurs when the magma enters and solidifies in lines of weakness or chambers in the earth's crust. Refer to the diagram and table below. The features on the left part of the diagram are landforms formed by intrusive vulcanicity. Note: The precise definition of bedding planes will be discussed in the Dynamic Earth elective. For now, bedding planes are rock layers. Intrusive rocks are formed by intrusive vulcanicity. When magma cools and solidifies in the earth's crust, rocks with large crystals are formed.