Tectonic processes such as earthquakes and volcanic eruptions release massive amounts of energy, and are constantly changing the face of our planet. Plate tectonic theory explains the motion of the continents and the changing shapes of the ocean basins. Be familiar with the dynamics of hot spots and mantle convection. 1. divergent 2. Granite forms by oceanic crust plus marine sediments being carried to the mantle by tectonic processes and melted, it solidifies at depth before reaching the surface.
Earth is the only planet with tectonic processes .
B. Density is mass per unit volume. The belief that continents have not always been fixed in their present positions was suspected long before the 20th century. This notion was first suggested as early as 1596 by the Dutch map maker Abraham Ortelius in his work Thesaurus Geographicus . However, it was not until 1912 that the idea of moving continents was seriously considered as a full-blown scientific theory. He contended that, around 200 million years ago, the supercontinent Pangaea began to split apart.