What comes down but never goes up?

The natural phenomenon that consistently descends without ever ascending is precipitation in its liquid form. Once water droplets become too heavy to remain suspended in the clouds, gravity takes over, pulling them earthward. This downward journey is the defining characteristic of this weather event.

While water itself is constantly cycling through our atmosphere, oceans, and land in what is known as the water cycle, the specific phase of falling from the sky is exclusively a downward movement. Water vapor rises through evaporation, forms clouds through condensation, and then, as droplets coalesce and grow, they eventually fall. The act of falling, however, is a one-way trip towards the ground, replenishing our planet's freshwater sources.

This essential process is vital for all life on Earth, nourishing plants, refilling rivers and lakes, and sustaining ecosystems. Without this constant descent, our world would be a very different, much drier place. From a light drizzle to a torrential downpour, the direction of this weather event remains consistently downward, a perfect fit for a curious riddle.