What does a scientist do? What is an engineer? What is technology? What do mathematicians do? Questions about the nature of STEM are fundamental to help elementary students gain a deep understanding of the STEM disciplines. Yet, starting a lesson with such abstract questions can be difficult for any learner. Instead, teachers can use concrete STEM activities to scaffold elementary students toward understanding the natures of STEM. Specifically, when students are encouraged to act like scientists and engineers through engaging in the science and engineering practices (SEP), questions about the natures of STEM are easier for students to grasp. This article has two major purposes: (1) provide questions worth exploring in the elementary grades regarding the natures of STEM; and (2) demonstrate how the natures of STEM can be embedded into STEM lessons using wind and water erosion as an example.