1. Crust: The outermost layer, the thin, solid, and rocky layer we live on. It's like the skin of an apple.

2. Mantle: The thickest layer, made of hot, dense rock that flows very slowly over millions of years. Think of it as the apple's flesh.

3. Core: The innermost layer, divided into the liquid outer core and solid inner core. The core is mostly made of iron and nickel. It's like the apple's seed.