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Before talking about Earthquake, we have to get a better understanding about the Earth, and what happen to it that causes the movement called Earthquake. Lets start saying that the Earth is divided into three parts: the crust, the mantle, and the core. The mantle of the earth is where many earthquakes begin, in that place, the temperatures are very hot. The heat causes some rock to soften; this softened rock is called magma that moves through the mantle in a circular motion. This process is called convection which is the force behind earthquakes. As magma circulates, the force of circular motion pulls the crust apart.
When this happens, it can leave a gap, or space, in earths crust; this gap is called a fault. A fault marks a weak spot where an earthquake can occur. Every earthquake has two parts; one part is called the focus. The focus is the spot inside earth where an earthquake occurs. The second part is the epicenter. The epicenter is the point on earths surface that lies directly above the focus, the area around the epicenter is in the most danger during an earthquake.
When an earthquake strikes, the ground shakes, buildings sway back and forth; other structures may bounce up and down, sometimes houses are bounced right off their foundations. Scientists developed two scales to describe earthquakes which are: the Mercalli scale and the Richter scale. A scale is a series of numbers that is used to measure an earthquakes power. The scale begins with the number 1, the higher the number is on the scale, the greater the damage the earthquake had caused.
An ocean can create a huge wall of sea water called a tsunami. No place on Earth is totally safe from earthquakes. But some places have more earthquakes than others. Once people learn how to live with earthquakes, their cities will become safer places.
Free research essays on topics related to: earthquakes, earthquake, mantle, scale, crust
Research essay sample on Circular Motion Earthquake Earthquakes
