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.
Summary There are three compositional layers in the earth, the core, the mantle, and the crust. The physical properties, of the outer portion of the earth produces the mesosphere, the asthenosphere, and the lithosphere. The lithosphere contains two different types of crust: oceanic and continental. The chemical composition of these types of crusts are different.