Born in the ocean, raised by the sun, when I return to the ocean my life is done. What am I?

This riddle cleverly describes the journey of a common substance vital to life. It begins its existence dissolved in the vastness of the sea, where minerals from rocks are carried into the water, making it salty. The "raised by the sun" part refers to the process of evaporation. As the sun's warmth causes seawater to turn into vapor and rise, the salt is left behind, forming crystalline deposits on land. This natural phenomenon is how sea salt is harvested, as the water evaporates and the salt crystallizes.

The final line, "when I return to the ocean my life is done," speaks to the solubility of this substance. Once it has been extracted and used, if it comes into contact with water again, it dissolves, rejoining the liquid environment from which it originated. While not a literal life cycle, it beautifully illustrates the transformation from a dissolved state to a solid crystal and back again.

Beyond its presence in the ocean, this substance, sodium chloride, is crucial for human health, playing a role in nerve function and fluid balance. It has also been a valuable commodity throughout history, used for preserving food before refrigeration, and even serving as a form of currency in ancient times. Its versatility and abundance make it an indispensable part of our world.