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.
The interior of Earth, similar to the other terrestrial planets, is chemically divided into layers. The mantle is a layer between the crust and the outer core. Earth's mantle is a silicate rocky shell with an average thickness of 2,886 kilometres (1,793 mi).The mantle makes up about 84% of Earth's volume.It is predominantly solid but in geological time it behaves as a very viscous fluid.he mantle lies between the core below and the crust above. The terrestrial planets (Earth, Venus, Mars and Mercury), Earth's Moon, two of Jupiter 's moons (Io and Europa) and the asteroid Vesta each have a mantle made of silicate rock.