Approximately 1,000 to 3,000 earthquakes occur each year in the Yellowstone area; most are not felt. The 1959 Hebgen Lake earthquake (M7.3) caused significant damage to park roads, show here near Gibbon Falls.
mantle definition. The region of the interior of the Earth between the core (on its inner surface) and the crust (on its outer). Note: The mantle is more than two thousand miles thick and accounts for more than three-quarters of the volume of the Earth.
Definition of Bio-mechanics. The area of study where the knowledge and methods of mechanics are applied to the structure and function of the living human system. Bio-mechanics is the science concerned with the internal and external forces acting on a human body and the effects produced by these forces.