Why isn't ground water salty?

Answer 1

Because fresh water comes from rain water, and the moisture in the clouds that form rain is salt-free. If salt water evaporates, the salt stays behind on the ground. But it is possible for a 'fresh water' late to be salty even though it is a long distance from the ocean, if that lake started to dissolve underground deposits of salt. There are some lakes that were made with rainwater that are located over salty ground and they are saltwater lakes. But most lakes are fresh water. I am amazed that the Great Lakes in the northern U.S.A. aren't salty, because it's hard to believe that all those tens of thousands of square miles of ground underneath them doesn't have a similar concentration of salt than the ground underneath the world's oceans. But I suppose if only a couple places on Earth had salt deposits under the oceans, that would be enough for the salt to dissolve and spread worldwide.

Answer 2

The water in rivers comes from streams, lakes and springs. Most lakes and streams are fed from rainfall and snow melt which does not contain salt. Most springs do not contain salt either.

Answer 3

Because unlike the ocean, there is no salt for ground water to absorb.

Answer 4

Precipitation is not salty because salt is not absorbed into the atmosphere. The precipitation that falls is stored in the atmosphere.

Answer 5

Because the salt that's in seawater - remains in the oceans as the water evaporates.

Answer 6

Because river water is fresh and ocean water is salt water.

Answer 7

Some do