mantle is the term for the thick layer surrounding earth’s outer core.
mantle is the term for the thick layer surrounding earth’s outer core.
what is the term for the thick layer surrounding earth’s outer core?
mantle
earth's outer core









































earth's outer core is a fluid layer about thick and composed of mostly iron and nickel that lies above earth's solid inner core and below its mantle. its outer boundary lies beneath earth's surface. the transition between the inner core and outer core is located approximately beneath the earth's surface. unlike the inner (or "solid") core, the outer core is liquid.









































section::::properties.









































seismic inversions of body waves and normal modes constrain the radius of the outer core to be 3483 km with an uncertainty of 5 km, while that of the inner core is 1220±10 km.
earth's outer core
estimates for the temperature of the outer core are about in its outer regions and near the inner core. evidence for a fluid outer core includes from seismology which shows that seismic shear-waves are not transmitted through the outer core. because of its high temperature, modeling work has shown that the outer core is a low-viscosity fluid that convects turbulently. the dynamo theory sees eddy currents in the nickel–iron fluid of the outer core as principal source of the earth's magnetic field. the average magnetic field strength in the earth's outer core was measured to be 2.5 millitesla, 50 times stronger than the magnetic field at the surface. the outer core is not under enough pressure to be solid, so it is liquid even though it has a composition similar to the inner core. sulfur and oxygen could be present in the outer core.
earth's outer core