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.

in cartography, a contour line (often just called a "contour") joins points of equal elevation (height) above a given level, such as mean sea level. a contour map is a map illustrated with contour lines, for example a topographic map, which thus shows valleys and hills, and the steepness or gentleness of slopes.

explanation:

c-14 is carbon-14, or radiocarbon.   it is a radioactive isotope of carbon with an atomic nucleus containing 6 protons and 8 neutrons.