[Flick Lives]

Nobody has yet to describe what “rockwool” is composed from and of.

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Rockwool is composed of basalt and chalk, melted at high temperature and then blown to aerate it much like cotton candy. Think of it as manmade aerated lava.

https://www.youtube.com/watch?v=-r8hzxzm4As

[TigersEye]

That was interesting too. Never knew what rockwool was made of.

Here's another great use for it if you're into gardening. It's a bit high-tech for me, I like gardening outdoors in soil, but fascinating. Lots of produce being grown this way now.

Rockwool Hydroponics Propagation and Transplanting Complete Guide