alot
oceans
An object that rotates has the tendency to continue rotating. There is no need for a continuous energy supply. In this case, the rotational energy was there from the moment that Earth formed. - Actually, to be precise, at first there was much more rotational energy; Earth's rotation has been slowing down due to tidal forces. It will continue slowing down until Earth always shows the same side to the Moon.
If you are talking about a non-magnet item then the item will become a magnet for a period of time. Changes in heat, how much it is used, or time can disable the magnet. Magnet!
No it's pretty much the whole magnet. Hope this helps :)
The primary thing that happens when heat energy from the sun is absorbed by the earth is that its own temperature rises. The atmosphere traps in much of this heat which creates the warm climates of the planet.
by stroking a magnet the right way you will make the magnet very happy, this will cause it to magnetise better, much like stroking a cat or dog. a happy magnet is a strong magnet
Earth's core is pretty much a dense, hot metallic sphere. It is hard because there has been so much pressure on it and heat. The outer core is indeed a magnet because scientists believe that it produces the earth's magnet field.
I assume you mean magnetic energy. There is not much to convert there. A magnet doesn't store large amounts of energy. And especially, it is not an energy source - whatever energy you get out of it, you have to put in first.
Demagnetizing. Place the magnet at the opposite end of the metal from where you magnetized it. Again, the magnet must make as much contact with the metal as possible. Rub the metal with the magnet in the opposite direction that you used to magnetize it.
half a billionth
99%
oceans
99%
The earth will become warmer.
~.08
its about just 1%
don't use so much energy