A mantle is more than just that ledge over your fireplace where you put pictures and candles. To scientists, themantle is an important and large part of the interior of the Earth.
The Earth may seem like a giant ball of solid rock, but its interior is actually made up of layers. The center of the Earth is the core and it is solid, kind of like the pit in a peach. The outer layer of the Earth is called the crust and is thin, like the skin of the peach. In between the two, in the meat of the peach, is the mantle, which can be further divided into the upper and lower mantle.