Rocks, boulders, mountains - it's all just rocks in the end.
Also really HOT rock, too!
It's rocks all the way down. Until it's molten rock.
Just rocks in different shapes, states, and with varying properties. A rock by any other name, as Shakespeare would say.
But are they... outlined rocks? *No-fail, soothing mood drains away and twitching begins.*
Separate names with a comma.