How Does the Ocean Stay Salted While Rivers Add Fresh Water?

The ocean is like a giant bathtub that never overflows with salt. Rivers pour fresh water and tiny bits of dust from mountains into this tub every day. You might think the extra water would make it tasteless, but nature has a clever system to keep the saltiness just right.

Every time it rains, water washes over rocks on land. This process breaks down rocks and releases tiny particles called minerals into the soil. When rain turns into streams, those streams carry these minerals to rivers. The rivers act like delivery trucks, driving all this salty treasure straight into the ocean.

If the ocean only got new water without losing any salt, it would eventually become huge and fresh. But the ocean loses salt too! Some salt sinks to the bottom when sea creatures use it to build shells. Other salt gets trapped in muddy rocks on the ocean floor. Because we add salt at roughly the same speed that we lose or remove it, the overall amount stays balanced. The ocean is not a closed box; it is an active cycle where salt is constantly recycled.