The center is the Moon's dense, metallic core. The core is largely composed of iron and some nickel. The inner core is a solid mass about 480 km in diameter. Surrounding the solid inner core is a fluid outer core that brings the total diameter of the core to about 660 km. Thanks to our leaky atmosphere; Earth loses several hundred tons of mass to space every day, significantly more than what we're gaining from dust. So, overall, Earth is getting smaller.

Dr Naresh,

This 'answer' to your own question appears to be identical to text I can find on another site.

https://moon.nasa.gov/inside-and-out/what-is-inside-the-moon/#:~:text=The%20inner%20core%20is%20a,core%20to%20about%20660%20km.

I do not think that you are using this site in good faith.