What causes the earth's magnetic field?

The same energy source that powers plate tectonics is also responsible for for the Earth's dynamo. Energy is released when material from our planets liquid core cools and solidifies onto the solid core. This energy stirs up the motions of the liquid core, and these motions generate a magnetic field.While there is also fluid motion in the mantle, it does not produces an appreciable magnetic field : The silicon rich rocks that comprises the mantle are poor conductors of electricity, and their motions are million times slower than those in the outer core. Hope this helps!

Question was not very clear if there are specific answer choices tell me and i'll try to you more. hope this though2 laps is 1 min. we know that for each min she does two times the amount of laps. for 12 laps we can do 12/2 which does give us 12 laps in 6 mins not 16 mins.

An  atom  (ours, not carroll's) consists of a positively charged  nucleus, surrounded by one or more negatively charged particles called  electrons. the positive charges equal the negative charges, so the atom has no overall charge; it is electrically neutral. most of an atom's mass is in its nucleus; the mass of an electron is only 1/1836 the mass of the lightest nucleus, that of hydrogen. although the nucleus is heavy, it is quite small compared with the overall size of an atom. the radius of a typical atom is around 0.1 to 0.25 nanometres (nm), whereas the radius of a nucleus is about 10-6  nm.  *  if an atom were enlarged to the size of the earth, its nucleus would be only 200 feet in diameter and could easily rest inside a small football stadium.read more on -