What are the two stages involved in the formation of particles of a new phase?

Nucleation and growth are the two stages involved in the formation of particles of a new phase. The nucleation process involves the formation of small particles of the new phase, which is stable and capable of continued growth. The growth stage is the increase in size of the new particles.

Crossing over creates new combinations of genes in the gametes that are not found in either parent contributing to genetic diversity

There would be no evaporation so no water cycle