Why is ocean water salty even though the rivers that flow into it are fresh

The video opens with a serene ocean scene, waves gently lapping against the shore, and a soothing voiceover begins. Voiceover: "Have you ever wondered why the ocean, the vast expanse of water that covers over 70% of our planet, is so salty? Especially when rivers, which flow into the ocean, are predominantly fresh?" The scene transitions to images of rivers winding through lush landscapes, carrying freshwater towards the ocean. Voiceover: "At first glance, it seems paradoxical. How does freshwater flowing into the ocean result in salty seawater? To uncover the answer, let's delve into the fascinating processes that govern our planet's water cycle." Graphics appear, illustrating the water cycle, with arrows depicting the movement of water from oceans to the atmosphere, precipitation onto land, and runoff back to the oceans. Voiceover: "The water cycle is a continuous journey, and it plays a pivotal role in shaping the composition of seawater. Rainfall washes minerals and salts from rocks and soil into rivers, which eventually carry these dissolved particles to the ocean." Animated visuals show rain falling on land, minerals being dissolved, and rivers transporting these particles to the ocean. Voiceover: "But here's the key: while freshwater evaporates from the ocean's surface, leaving the salts behind, it's not a one-way journey. The water vapor rises into the atmosphere, forming clouds and eventually condensing into rain, completing the cycle." As the voiceover explains, animations depict water vapor rising, cloud formation, and rainfall replenishing the rivers and oceans. Voiceover: "With each cycle, the ocean becomes incrementally saltier, as the dissolved minerals accumulate over millions of years. This process, known as 'chemical weathering,' is a fundamental mechanism driving the salinity of seawater." The video then transitions to real-world footage of scientists conducting experiments and analyzing water samples. Voiceover: "Scientists study the composition of seawater through various methods, including chemical analysis and oceanographic expeditions. Understanding the complex interplay of geological, chemical, and environmental factors helps unravel the mystery of ocean salinity." The video concludes with a call to action, urging viewers to appreciate the intricate processes that sustain life on Earth and to continue exploring the wonders of our planet's oceans. Voiceover: "So, the next time you gaze out at the vastness of the ocean, remember the hidden story behind its salty embrace—a story of geological forces, hydrological cycles, and the endless dance of water and minerals that shape our world." The screen fades to black, leaving viewers with a newfound appreciation for the intricate dynamics of ocean salinity. This video was made very intelligently