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.
RADIATION â when heat is transferred through EMPTY SPACE (in the form of electromagnetic waves) RECALLâ¦â¦ LITHOSPHERE = The SOLID, RIGID outer portion of the Earth that is composed of the CRUST and UPPERMOST MANTLE. ASTHENOSPHERE = The HOT, SOFT, WEAK, SLOW MOVING portion of the UPPER MANTLE. Lithosphere FLOATS on top of the Asthenosphere