Crystallization

Brains On! Why Are No Two Snowflakes the Same?
Brains On!

From a distance, snowflakes may all look the same, but they are not.

https://www.brainson.org/episode/2016/01/13/why-are-no-two-snowflakes-the-same
ACS: Inquiry in Action - Matter is Made of Tiny Particles (Lesson 1.3): Dissolving and Back Again
ACS (American Chemical Society)

Students dissolve salt in water and allow the water to evaporate to investigate the question: What process causes salt to dissolve in water and then the water to evaporate?

https://www.acs.org/content/acs/en/education/resources/k-8/inquiryinaction/fifth-grade/chapter-1-investigating-matter-at-the-particle-level/lesson-1-3--dissolving-and-back-again.html
ACS: Science ABCs - 'C' is for Crystals
ACS (American Chemical Society)

How does Carlita make her crystals?

https://www.acs.org/content/acs/en/education/whatischemistry/adventures-in-chemistry/science-abc/c-is-for-crystals.html