This image shows the rio grande, a river that separates texas and mexico.
which type of boundary is this?
a) cultural
b) geometric
c) physical
d) religious

The Rio Grande is an example of a physical boundary, other examples exist where boundaries correspond with any rivers, mountains, deserts, or really any defining body of water. A cultural boundary would be the borders between countries or regions that also corresponds to differences in ethnicity, language, and cultural norms, a geometric boundary would be the border between countries without regard to physical boundaries, such as the US-Canada border, and religious boundaries would be state boundaries that also correspond to religious differences, such as between primarily Hindu India and primarily Muslim Pakistan. 

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