View the model of the United States
What is most likely limitation of this model

From this model of the United States shown, the likely limitation is that it does not show the mountain regions. From the map, the countries to the North and South are shown, major rivers are shown, and the oceans surrounding America are shown.

chemical changes occur when a substance combines with another to form a new substance, called chemical synthesis or, alternatively, chemical decomposition into two or more different substances. these processes are called chemical reactions and, in general, are not reversible except by further chemical reactions. some reactions produce heat and are called exothermic reactions and others may require heat to enable the reaction to occur, which are called endothermic reactions. understanding chemical changes is a major part of the science of chemistry.