Many scientists are concerned that the ogallala aquifer in the united states is being depleted at an alarming rate. what would most likely be a major effect of this aquifer running dry? many crops would die because irrigation water would be limited. the water cycle would come to a halt in the area. farmers would have to water crops with salt water. most people in the united states would not have drinking water.

The correct statement is many crops would die because irrigation water would be limited.  

The Ogallala aquifer plays an important role in the farming of plants. For many years, it has been utilized without taking into consideration the long-term influence of the source getting empty. Many farmers are increasing the size of their farmlands in order to achieve bigger profits. Various plants planted are also very demanding of water, for example, commercial plants like almonds.  

As it became evident that the water for irrigation is coming to an end, many farmlands have got abandoned, and their plantations had been destroyed, and this procedure will take place until and unless no water gets left in the aquifer.  

a. decomposes use carbon from dead organisms as fuel for cellular respiration, returning carbon dioxide back into the atmosphere.