You are right, if one sees roots it doesn't mean there aren't other roots. I think the difference is, South Finland was compressed by 1 km of ice during the la

You are right, if one sees roots it doesn't mean there aren't other roots. I think the difference is, South Finland was compressed by 1 km of ice during the last ice age, and the ground is pure granite that is blown up using explosives whenever a new building or road is built. In those places I talk about, the dirt layer is extremely thin or often nonexistent. The photos I linked don't show that, but many trees are clearly sitting on pure red granite rock with just a little bit of dirt and moss surrounding the roots, in the middle of pale rock.