Tectonic activities occur mostly at or near the areas near the surface of the earth where tectonic plates meet. These plates are like slowly shifting pieces to a puzzle that makes up the earth's outer skin. <span>Activity can also occur where the Earth's liquid mantle comes particularly close to the surface. </span>
It is a book written by Galileo Galilei comparing the Nicolaus Copernicus, published in 1632 aa his dialogue if the two chief world systems.
As in the Copernican system of the universe the earth and the other planets orbit around the sun and while in the Ptolemaic system all orbited around the earth. Simplicio which is a dedicated follower of Ptolemy and Aristotle then presented his traditional simple views.
Being a geocentric philosopher he opposed the heliocentric which proposed the sun in the center.
