Investigates high-achieving fifth-grade students' achievement gains and conceptual reorganization on convection. Features an instructional sequence of three dyadic inquiry investigations related to convection currents as well as pre- and post-assessment consisting of a multiple-choice test, a card sorting task, construction of a concept map, and an interview. Discusses implications for heterogeneous grouping and construction of knowledge by dyads. (Contains 47 references.) (Author/YDS)