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what does it mean when we say that water molecules break apart?

I give you the word equation first and then the chemical equation.

Water + electricity = Hydrogen + Oxygen

What that means is that if you have same sort of mineral that won't separate with the electricity put in the water, then you get the water "breaking down" into oxygen and hydrogen.

2H2O ===> 2H2 + O2

At this stage you don't have to worry about what the 2 in front of the hydrogen and the 2 in front of the water means. One of the properties of water is that it is hard to get the water molecule to break down.  Not impossible. Just hard.

that would be called plucking : )

explanation:

''plucking, also referred to as quarrying, is a glacial phenomenon that is responsible for the erosion and transportation of individual pieces of bedrock, especially large "joint blocks". as a glacier moves down a valley, friction causes the basal ice of the glacier to melt and infiltrate joints (cracks) in the bedrock."