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The combined volume of all the water on Earth is estimated at around 1.4 billion cubic kilometers. To visualize this, imagine a giant cube measuring approximately 1,200 km on each side, encompassing oceans, glaciers, underground reservoirs, and freshwater lakes. This immense quantity emphasizes the vital importance and scale of Earth's hydrosphere.
The Living Marine Worlds as a Cube
Turning to the ocean's life, all marine organisms collectively contain roughly 6 gigatons of carbon. If we were to represent all marine life as a solid cube, it would measure around 3 kilometers on each side. Although tiny compared to the planet itself, this size reflects the substantial biological mass sustained within Earth's oceans.