How the deep trenches have deep seated earthquake occurence while in the mid oceanic ridge ares the quake foci have shallow depth explain sea floar spreding?
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The Earth is formed of four concentric layers that have very different physical and chemical properties: inner core, outer core, mantle and crust.
The centre or inner core is the hottest part of planet Earth. A solid mass of iron and nickel this centre has temperatures up to 5,500 degrees Celsius. With this extraordinary heat the inner core functions as engine for the planet:Surrounding the outer core is the outer core, a liquid layer of iron and nickel, extremely hot, this layer has similar temperatures to the inner core:The widest section of the Earth is the mantle with an approximate diameter of 2,900 km. The mantle is composed of semi-molten rock called magma. The upper parts of the mantle are hard rock but deeper within the rock is softer and beginning to melt:The outer layer of the planet is known as the crust. It is a solid rock layer which averages about 60 kilometers in thickness.
The structure of the Earth
The centre or inner core is the hottest part of planet Earth. A solid mass of iron and nickel this centre has temperatures up to 5,500 degrees Celsius. With this extraordinary heat the inner core functions as engine for the planet:Surrounding the outer core is the outer core, a liquid layer of iron and nickel, extremely hot, this layer has similar temperatures to the inner core:The widest section of the Earth is the mantle with an approximate diameter of 2,900 km. The mantle is composed of semi-molten rock called magma. The upper parts of the mantle are hard rock but deeper within the rock is softer and beginning to melt:The outer layer of the planet is known as the crust. It is a solid rock layer which averages about 60 kilometers in thickness.
The structure of the Earth
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