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Earth

For year's man have studied the earth and the atmospheres to understand how life only exists on earth. There are many factors that have to work together in order for this to happen. The study of the earth and its structure is called Geology. Earth is the third planet from the sun and the fifth largest. Planet earth is only a tiny part of the universe. Earth is the only planet whose English name does not derive from Greek/Roman mythology. Earth is the densest major body in the solar system.
The crust is quite thin, is about 22 miles thick and beneath the continents and about only 3 miles thick beneath the ocean. Its thickness beneath the mountain is about 40 miles thick. The inner core and mantle are plastic. The mantle is the middle layer of the earth. It is about 1800 miles thick and makes up the largest portion of the earths interior. Between the crust and the mantle there is a boundary called the Moho? The Moho was discovered by the creation geologist. Like the crust, the mantle is made of solid rock.
Beneath the mantle lays the core which is the inner most region of the earth. The core exists from the bottom of the mantle all the way to the center of the earth which is about 4000 miles beneath our feet. Unlike the rock of the crust and mantle the core is composed of dense metal like iron and nickel. The earth core is divided into 2 sections the outer core and the inner core. The outer core is white hot and consists of melted iron and nickel. The inner core is a mass of even hotter metals, but it remained solid instead of a liquid because upon me a ball of metal ties at the center of the ear, and half between the north and South Pole it is an imaginary circle around it called the equator. The earth is not exactly rounding, but slightly flattened at poles. At the plus the earth measures 24901 and 55 miles, it takes an astronaut 90 minutes to circle the earth in space, but two days for a fob airplane o circle the earth.
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