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Children's Dictionary
core the center part of any round, solid object. The center of the earth is called its core. [2/4 definitions]
electromagnet an iron or steel core with wire wound around it. It becomes magnetic when an electric current is passed through the wire.
essentially at the core; when the most important part is considered.
kernel the most basic part of something; the heart of the matter; core. [1/3 definitions]
mantle the layer of the earth that lies between the crust and the core. The crust is the top layer of the earth--the layer we live on. The core is the center of our earth. The mantle is very thick and makes up most of the entire planet. [1/2 definitions]