Science Plate Tectonic Theory Essay

Science Plate Tectonic Theory Essay

Plate Tectonics have always been a mysterious subject to discuss and scientists are looking for facts to prove their own theories. Indeed, scientists today have a better understanding of the Earth's tectonic plates, the driving forces and the cause of their movement, and the ways and connections in which they interact with one another. A tectonic plate is defined as a rigid segment of the Earth's lithosphere that travels independent of other plates surrounding it. There are seven major plates, North America, South America, Eurasia, Africa, Indo-Australian, Pacific and Antarctica as well as many smaller, microplates such as the Arabian Plate and Indian Plate.

Plate tectonic theory began in 1915 and was

In one’s impression, volcano is like a magnificent figure that allows hot lava, volcanic ash, and gases to escape from a hole on the top of a volcanic mountain. In fact, it is true as all the human can observe, but what many people do not know is that the lava and all the thing a volcano released are mostly from the magma chamber below the surface. Earth’s volcanoes occur because the plate’s crust is broken into 17 major, rigid tectonic plates that float on a hotter, after layer in the Earth's mantle. Therefore, on Earth, volcanoes are generally found where tectonic plates are diverging or converging. Volcanic eruptions vary in size and explosiveness. Volcanologists（special geologists) take a number of factors into account when they catagorize the amount of a volcanic eruption. As one can see from the chart below, small volcanoes occur more frequently and truly dangerously explosive volcanoes do not happen very often. For a large eruption, it takes much time for pressures and energy to build

Beside its damage whether in the urban city area or the rural area, the pollution that earthquake causes is unbelievably critical and harmful to earth. For example, the undersea megathrust earthquake off the coast of Japan that occurred at 14:46 JST (05:46 UTC) on Friday 11 March 2011. The earthquake caused severe tsunami and destroyed huge amount of nuclear power plants in Japan. The power plants that were being destroyed in the accident include Fukushima Daiichi, Fukushima II, Onagawa Nuclear, Tōkai, and Rokkasho Reprocessing Plant. In the Fukushima Daiichi Nuclear Disaster, According to the Federation of Electric Power Companies of Japan, by April 27, approximately 55 percent of the fuel in reactor unit 1 had melted, additional with 35 percent of the fuel in unit 2, and 30 percent of the fuel in unit 3. The overheated spent fuels in the storage pools of units 3 and 4 probably were also being damaged. Hazardous and incredibly harmful radioactive elements being released into the sea and air around Fukushima, and causing accumulation at each step of various food chains. For example, into algae, crustaceans, small fish, bigger fish, and then humans; or soil, grass, cow and milk, then humans. From these sample chains, one notice that human beings are the top and most affected part in the food chain. the radioactive objects entering the body, elements called