El agua cubre el 70% de la superficie terrestre. ¿

Many of us often hear that water covers about 70% of the Earth's surface, but picturing all that water gathered in one place is challenging. Imagine compressing every ocean, sea, river, lake, and underground reservoir into a single sphere. Surprisingly, its radius would be approximately 700 kilometers—significantly smaller than Europa, Jupiter’s icy moon, which has a radius of around 877 kilometers. This comparison reveals how precious and limited Earth's total water supply really is. Although water seems abundant when spread across vast oceans, when seen as a whole, it shows that water is not unlimited, underscoring the importance of conserving and protecting this vital resource. The majority of Earth’s water (about 97%) is saline ocean water, while only around 3% is freshwater, and most of that freshwater is locked in glaciers and underground. The amount of readily accessible freshwater for human consumption is even smaller, making sustainable water management essential. Visualizing Earth's water this way helps us appreciate its rarity and our responsibility to maintain its quality and availability. Water supports ecosystems, agriculture, industry, and our daily lives, and understanding its true scale encourages wiser usage and protection efforts around the globe.