Respuesta :

Four; the upper atmosphere, the atmosphere, the mantle, and the core.

Answer:

Four layers

Explanation:

There are total four layers of Neptune. These four layers are - core, mantle, atmosphere, and upper atmosphere

a) Core – It is made up of rock and ice

b) Mantle – It is made up of water, ammonia, and methane ices.  

c) Atmosphere – It is made up of hydrogen, helium, and methane gas

d) Upper Atmosphere – It has trace amount of helium