A train that travels between cities is an… train., submarine, subheading, intercity, A boat that travels under the sea is a…, submarine, interact, international, When two people talk and work together, they…, subdivide, interact, submerge, A smaller heading under a main heading is a…, submarine, intercity, subheading, Something involving many countries is…, international, subway, subzero, To go under the water means to…, interact, submerge, interlock, An underground railway is a…, subway, intercity, international, If something is below zero, it is…, subway, subzero, interzero, To divide something into smaller parts means to…, intercity, interact, subdivide, Two pieces that fit and lock together can…, interlock, submarine, subheading

Prefixes sub- and inter-

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