Repositories for the radioactive waste disposal are the the burial facilities, which are excavated in higher depth ( approximately 1000 feet below) having stable geologic environmental conditions.
They are used for burying radioactive waste so as to avoid the exposure of human population and environment with radioactive material ( which could be hazardous to lives as well as environment) present in the waste.
They could be built in any area that is geologically suitable for burying waste. This means that they have no relation with the size of population in that area.
I suppose it's a zygote. In haplontic life cycle haploid gametes fuse together creating the zygote (diploid) that promptly divides meiotically creating 4 haplontic cells serving as spores.
When warm air hits the cold surface, it reaches its dew point and condenses. This leaves droplets of water on the glass or can. When a pocket of air becomes full of water vapor, clouds form.
