Geography Unit 3 Essay

710 Words3 Pages
Option 1: 19: In this essay, I will be looking at the causes of seismic and volcanic events, the distribution of them, and whether it does or doesn’t link to the theory of plate tectonics. Plate tectonics theory is the scientific theory that attempts to explain the movement of the Earth’s lithosphere that is divided across the Earth’s surface. However, due to the fact that this idea hasn’t been justified yet because we haven’t been able to explore into our inner Earth, some people disagree with it. There are various different ways in which scientists have used to try to explain this theory, such as fossils and magnetic stripping, but in this essay I will be looking at whether seismic and volcanic activity can justify it. Firstly, I will look at seismic activity. As we all know, the main form of seismic activity is an earthquake. An earthquake is caused by a sudden slip on a fault, and gets stuck at their edges due to friction. This results in a sudden release of energy in the Earth’s crust that creates seismic ways. The main characteristics of an earthquake include shaking of the ground and even rupture sometimes, soil liquefaction where water saturated material loses its strength and transforms into a liquid, and sometimes tsunamis, which are caused by a large displacement of water. Earthquakes are measured by the Richter scale, which is a logarithmic scale that measures the magnitude of an earthquake. When you look at seismic activity on a map, you’ll see that all seismic events occur on plate margins, including both oceanic and continental. So this must mean that the only way to explain how these earthquakes occur is because the plate margins are moving – plate tectonics theory. This doesn’t just mean that we can prove the theory; it also means that we can now predict generally where earthquakes are likely to happen in the future. However, unfortunately it

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