A tree? A bolt of lightning? A river delta seen from space? A branching crack seen under a microscope? Does it matter?
Water is blue, and not because of reflection or scattering or any of that; it’s blue just because it is. That’s not much of an explanation though. The more scientific version is that its blue because it has an absorption minimum at the blue end of the visible part of the electromagnetic spectrum. It absorbs more of the other colours and lets a little more blue through for us to see. Only a little more though, which is why you need a swimming pool’s worth of water to notice.
A weather map from one of our recent storms, with an area of low pressure sucking in swirling winds. The pressure difference that caused all the drama was less than the pressure of a small child’s footprint, but it covered an area larger than Ireland and so unleashed a huge amount of energy. Little changes go a long way when you’re dealing with something the size of the atmosphere.