convection currents occur in the tropics layer of earth.
convection currents occur in the tropics layer of earth.
what layer of earth do convection currents occur?
the tropics
rising convection currents occur where two plates are moving away from each other. in the gap, thus produced hot magma rises up, meets the cooler sea water, cools, and solidifies, attaching to either or both tectonic plate edges creating an oceanic spreading ridge. when the fissure again appears, again magma will rise up, and form new lithosphere crust. if the weakness between the two plates allows the heat and pressure of the asthenosphere to build over a large amount of time, a large quantity of magma will be released pushing up on the plate edges and the magma will solidify under the newly raised plate edges, see formation of a submarine volcano. if the fissure is able to come apart because of the two plates moving apart, in a sudden movement, an earthquake tremor may be felt for example at the mid-atlantic ridge between north america and africa.
submarine earthquake
earth's magnetic field, also known as the geomagnetic field, is the magnetic field that extends from the earth's interior out into space, where it interacts with the solar wind, a stream of charged particles emanating from the sun. the magnetic field is generated by electric currents due to the motion of convection currents of molten iron in the earth's outer core: these convection currents are caused by heat escaping from the core, a natural process called a geodynamo. the magnitude of the earth's magnetic field at its surface ranges from 25 to 65 microteslas (0.25 to 0.65 gauss). as an approximation, it is represented by a field of a magnetic dipole currently tilted at an angle of about 11 degrees with respect to earth's rotational axis, as if there were a bar magnet placed at that angle at the center of the earth. the north geomagnetic pole, currently located near greenland in the northern hemisphere, is actually the south pole of the earth's magnetic field, and conversely.
earth's magnetic field