Run-off allows the contents and characteristics of the environment to make their way into nearby water supplies.
Run-off is described as water from precipitation (rain) that runs off the land and into nearby bodies of water. This water often contains:
which are taken from the surrounding land before the water reaches the larger body to which it flows.
This allows us to infer that the levels of potassium of the dead sea are so elevated because of the high concentration of this compound in the surrounding environment. As rain falls onto the land surrounding the dead sea, potassium from the environment reaches the sea via run-off, ever-increasing the levels of potassium in the water.
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