P2-Layers+of+the+Earth

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= LAYERS OF THE EARTH- = = [] = =[]= = Crust : ﻿ ﻿ The crust is the most outer layer of the Earth,23 miles thick beneath the continets, and about 6.5 miles think beneath the oceans. Its catergorized into two parts, the Oceanic crust and the continental crust. The oceanic ﻿crust is the smallest parth of earth and is 0-6 miles. The Continental crust is the second smallest area of the Earth composed primarly of crystalline rocks made low-density buoyant minerals dominated by quarts and feldspars. =

=﻿ Mantle: The mantle is the thickest layer of the earth. It measures nearly 200 kilometers (1700 mi.). The mantle, made of hot rock is less dense than the metallic core. The very top of the mantle is cool and rigid. Just below that, the rock is hot and soft enough to move like a thick paste. = = D layer: D=200-300 km. It covers about 4% of the mantle-crust mass. It also differs in chemical composition from the lower mantle above it. = =Transition Layer: Also known as the mesosphere. It is made of mainly basaltic magmas with amounts of calcium, aluminum and gamet.=

=﻿ Outer core: The outer core of 200-300 kilometers (125-188 miles) and represents about 4% of the mantle-crust mass. It's composed of iron and nickel, between the core and the mantle. The temperature of the outer core ranges from 4400 degrees Celsius in the outer regions. This layer is sometimes identified as part of the lower mantle due to its geographical nature. = =Inner core: The inner core is a solid section of the earth and is unattached to the mantle, being suspened by the molten outer core.It is a primarily solid sphere about 1,220 km in radius.=