Vocabulary: match the word that best matches key term definition. natural boundary a. to gain or acquire culture hearth b. a large temple built by the Sumerians embargo c. a center where cultures developed and from which ideas and traditions spread outward qanat d. an underground canal first build by the ancient Persians assume e. a ban on trade ziggurat f. wedge-shaped symbols that were pressed into clay tablets participate g. a boundary created by a physical feature, such as a mountain, river, or strait cuneiform h. to take part in