The structure of Earth can be defined in two ways:
Mechanically: Asthenosphere, mesospheric mantle, outer core, and the inner core.
Chemically: Crust, upper mantle, lower mantle, outer core, and inner core.
We can divide it in three main parts and its sub-parts:
1. Continental crust (25-40 km?)
2. Oceanic crust (~6 km)
1. Upper mantle (650 km)
2. Lower mantle (2235 km)
1. Outer core: liquid (2270 km)
2. Inner core: solid (1216 km)