In my opinion, LHP and RHP cannot be defined abstractly, in terms of just one aspect of the principles or aims of a particular path. Instead, I regard LHP and RHP as groupings that have evolved spontaneously, and whose meaning is mainly social and historical.
The cold plate causes the moisture in the warm air, which is inside the jar to condense and form water droplets. This is the same thing that happens in the atmosphere. Warm, moist air rises and meets colder air high in the atmosphere. The water vapor condenses and forms precipitation that falls to the ground.
Erosion by water and ice. Water, even as rainfall, is majorly responsible for erosion. When a raindrop falls, it can displace the soil particles, which are then washed off in heavy rain and deposited at the base of a slope. Effectively, the rain water has moved soil from location and deposited it at another.