Geology Volcanoes&Earthquake Assignment1 Assignment

Geology Volcanoes&Earthquake Assignment1 - Assignment Example They occur in clusters and linear chains all over the world. Regardless of few exceptions to this rule, most take place in lines that are curved, as opposed to circular ones. The two common patterns that they form called the ring of fire and the mid-ocean ridges (Oxlade 12). Plate tectonics explain the movement of plates around the earth but are different from continental drift. They elucidate why ocean basins are in existence. The earth’s crust, according to the theory of tectonics, occurs in two forms: continental crust and oceanic crust. The latter is rigid, dense, and brittle as opposed to continental crust. It breaks into separate slabs also known as plates (McKay, â€Å"Plate Tectonic Settings† 1). On the other hand, many rocks that have conjoined over billions of years or geologic time make the continental crust. They are less dense, and can deform or change much easier explaining their complication and uncertainties. Summing it all up, hot gases and material emanate from the mid-oceanic ridges while cool material goes down at subduction areas, and it is at the plate boundaries that volcanoes take place (McKay, â€Å"Subduction Zones† 1). Volcanoes erupt as fresh magma from the center of the earth rises up through weak areas or zones and consequently reaching the crest of ridges to develop novel oceanic crust. This process referred to as seafloor spreading, took place many years ago, and it led to long mid-oceanic system of ridges (McKay, â€Å"The Basics of Plate Tectonics† 1). The website, blackboard learn, is a modernized platform that offers easy access, navigation, organization, and illustration of learning material. The site’s contents are well organized, and students can easily follow the direction of the course without supervision, assistance, or any trouble. What makes the educational portal even better is the systematic organization of classes