I believe it is Gila river, San Juan river, The Green River, and the Gunnison river.
A landform is a topographic feature of earth.
The Dead Sea has a very high salt content however, The Dead Sea is shrinking, and as it recedes, the fresh water aquifers along the perimeter of the lake are receding along with it. As this fresh water diffuses into salt deposits beneath the surface of the shoreline, the water slowly dissolves the deposits until the earth above collapses without warning. More than 1,000 sinkholes have appeared in the past 15 years.
The Dead Sea is located bordering Israel, the West Bank and Jordan
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Crystal structure is a way how atoms or molecules are arranged and in what manner to form a Crystal and this arrangement helps to differentiate one crystal from the other.
Using a crystal structure we can tell that crystal of pyrite is cubic and crystal of gypsum is mono-clinic which helps to tell us that both the crystals are separate from one another because of the arrangement of the molecules and atoms in both.