The layers of Earth are:
1-Crust:the outermost layer
2-Mantle :the middle layer
3-Core :innermost layer
The earth is technically the 3rd planet from the sun between Venus and Mars and has an equatorial diameter of 12,755 kilometers (7926 miles) and a polar diameter of 149.6 million kilometers (92.9 million miles). The earth is in a constant state of motion as it revolves round the sun, which takes a period of 365.26 days. Most of the earth is covered with water which makes it unique and enables life to exist.
The earth is made up of several layers and each has unique properties, characteristics, composition and affects the inner processes of the earth differently. The layers are from the exterior to the interior and are largely grouped into four including: the crust, the mantle, the outer core, and the inner core.
The Earth can be divided into one of two ways – mechanically or chemically. Mechanically – or rheologically, meaning the study of liquid states – it can be divided into the lithosphere, asthenosphere, mesospheric mantle, outer core, and the inner core. But chemically, which is the more popular of the two, it can be divided into the crust, the mantle (which can be subdivided into the upper and lower mantle), and the core – which can also be subdivided into the outer core, and inner core.”
The earth’s crust is the outmost and first layer of the earth. It is the hardened part of the Earth with a depth of about 5 to 70 kilometers (~ 3 to 44 miles) and makes about less than 1% of the entire Earth’s volume. The earth crust is split up into two parts: the oceanic crust and the continental crust.
The continental crust is approximately 60 kilometers thick while the oceanic crust is about 5 kilometers below the ocean. The ocean crust is the largest and takes up to 71% of the earth’s crust while the continental crust take up the remaining 29%. The continental crust consists of rocks such as the igneous rocks, and the oceanic crust is consists of basalt and sedimentary rocks.
The rocks in the continental crust are estimated to be about 3.9 billion years old. The average density of the oceanic crust is 3g/cm while the average density of the continental earth is 2.7g/cm. The crust temperature is approximately 200 to 400 degrees Celsius. The Earth crust is also always in constant motion and as such, it is the layer where tectonic plates are found.