Violent Terraforming Measures

I would love to see more options to rapidly terraform, maybe with an added pollution debuff as a counter incentive. These are two ideas I had.
Explosive Charges for Cliffs and Mountain Sides, yields no direct product. Could be used to create openings for a ramps on steep terrain. Or to "split" a mountain range in half so train tracks can be laid (see picture)
Fire Deforestation for large areas (could yield coal and/or ash that could be used as fertilizer for example). Player would have to create an isolated patch first to keep fire under control

Maybe harder types of rock would require explosives to blow off chunks. Because currently excavators can mine everything, not sure if they can do that IRL

Excavators can go through pretty much everything solid enough to dig.
That said I do really like the idea of mining explosives. We have asteroids after all.