Weather systems, forest life, garden flowers, and dramatic landscapes: this category collects the natural world into themed word lists. The vocabulary ranges from everyday (rain, oak, meadow) to satisfyingly specific (cumulonimbus makes an appearance in the hard tier).
These puzzles pair well with earth science units and outdoor-themed events. As everywhere on this site, difficulty is explainable: easy grids run 10×10 with forward words only, while hard grids run 16×16 with all eight directions.