Another difference that can be seen between profession and occupation, is that the former is guided through certain ethical codes, and is regulated by a certain statute. Summary: 1. A profession needs extensive training and specialized knowledge. On the other hand, an occupation does not need any extensive training.
1. One of the confusing concepts of Earth structure is the distinction between chemical layering (crust, mantle and core) and mechanical layering (lithosphere, asthenosphere and mesosphere). The scale model illustrates all of these layers on a single diagram.ne of the confusing concepts of Earth structure is the distinction between chemical layering (crust, mantle and core) and mechanical layering (lithosphere, asthenosphere and mesosphere). The scale model illustrates all of these layers on a single diagram.
The three layers of the Earth(because there is another layer so it  is not main) . Based on chemical composition are the core,  the mantle and the crust. The core is the in â¦ ner part  of the earth, the crust is the outer part and between them is the  mantle.hemically, however, the solid portion of Earth can be divided into three distinct layers. In order from the surface going down, they are as follows: 1. The Crust-- Major chemical constituents are oxygen, silicon, and aluminum. 2.