“…According to the National Science Education Standards, "scientific inquiry refers to the diverse ways in which scientists study the natural world and propose explanations based on evidence derived from their work" (National Research Council [NRC], 1996, p. 23). As mentioned above, to date, most prior work on children's science learning during the early years has focused on parent-child scientific conversations or their involvement in children's early science learning (e.g., Butler, 2020;Kurkul et al, 2022;Leech et al, 2020;Saçkes, 2014;Saçkes et al, 2019;Willard et al, 2019), a specific school curriculum (Peterson & French, 2008;Saçkes et al, 2020), targeted scientific inquiry skills (Lanphear and Vandermaas-Peeler, 2017;Saçkes, 2013), science and math-based classroom activities (Hobson et al, 2010;Inan et al, 2010;Saçkes et al, 2011;Lanphear & Vandermaas-Peeler, 2017) or brief, short-term conversations about variety of topics in the classroom (Kurkul et al, 2022). Although prior research has demonstrated how inquiry-based learning and question-explanation exchanges with parents and teachers foster children's early STEM learning and engagement; such approaches do not allow us to explore changes and variability in teacher-child conversations over time during an extended inquiry unit that arises based on children's interests in the preschool classroom.…”