20 days later in our Science observation

This afternoon in Science, we have been looking at what has happened to the screws in the liquids, which were: milk, apple juice, water and coffee.
We have discovered that the screw in the coffee has stayed the same, however the coffee itself has grown a form of skin that looks disgusting and mouldy!
The milk has turned into white cheddar! The screw however, has not gone rusty.
The apple juice has grown mould on top of mould! The screw is rusting and parts of the metal have eroded and are floating in the jar as well as fluff from the mould.
A jar of plain water has turned the head of the screw rusty and there are bits of rust floating in the water.

We will observe the contents after half term to see if there have been any other changes.