Category: Planet Earth. Last updated June 20, 2023.

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Do you prefer the vibrant changing colors of fall, or the warm summer air? Maybe it’s the crisp white snow, or the new spring flowers? Investigate the chemistry that gives each season its distinct characteristics.


  1. Activities
  2. Labs
  3. Articles
  4. Videos


  • Experimenting with UV-sensitive Beads from NASA
    Students experiment with ultraviolet (UV) light-sensitive plastic beads, which are generally white but turn colors when exposed to UV light.


  • Pizza Box Solar Oven from Scientific American
    Harness the sun’s energy to get your s’more marshmallows nice and gooey.
  • Winter Crystals from AACT
    Experience the exciting crystallization process while creating a snowflake.
  • Chemistree from AACT
    Create unique snowy trees using solutions, and recrystallization.
  • Natural Insect Repellent Recipe from ThoughtCo.
    Like the great outdoors, but not all the insects you might find there? Learn how you can make your own insect repellent.


  • Green Sunscreen from University of Florida News
    Everything else is going green—why not sunscreen? Marine organisms hold the key.
  • Understanding UVA and UVB from Skin Cancer Foundation
    Learn the A B C’s of UV rays. What makes them different from each other? What does your skin need for full protection?
  • How Does Sunscreen Work? From PBS News Hour
    Quick trivia questions: When was the first widely used sunscreen created? What did it look like? The answers are here!
  • The Chemistry of Sunglasses from Compound Chemistry
    Don’t just protect your skin in the summertime—your eyes need some chemistry cover-up too.


  • Why Do Leaves Change Color? From ACS Reactions
    Ever wonder why some leaves turn red, others yellow and some just turn brown? Learn why with this Reactions video.

  • How Does Salt Melt Ice? From ACS Reactions
    Breaking down the chemistry behind keeping roads safe when cold weather hits.