n. 25B6; noun
a deep rift in the ice : CRACK, fault, flaw, split, break, breach, fissure, fracture, cleft, crevice, cavity, opening.
the rift between them : BREACH, division, split; quarrel, squabble, disagreement, falling-out, row, argument, dispute, conflict, feud; estrangement; informal spat, scrap; Brit. informal bust-up.