Explain the process of crystallization with example

Crystallization is a natural process which occurs as materials solidify from a liquid, or as they precipitate out of a liquid or gas

Explanation:

ex: Snowflake formation.

Crystallization of honey in a jar.

Stalactite and stalagmite formation.

Gemstone crystal deposition.

the reaction mixture contains some ammonia, plus a lot of unreacted nitrogen and hydrogen. the mixture is cooled and compressed, causing the ammonia gas to condense into a liquid. the liquefied ammonia is separated and removed. the unreacted nitrogen and hydrogen are then recycled back into the reactor .

im not exactly sure but i think its b!