The True Book of Oceans Author:Katherine Carter This is a primary science book. I will quote from the first page since there is no discription. "Ocean waters are salty. Smaller bodies of salt water are often called SEAS. Long ago people got salt for their food from the ocean. Now we get it from salt mines. The mines are in places that were once covered by salt water. Now the water is gone. Bu... more »t it left tons of salt."« less