Sociocultural language learning theory and situated learning theory stress the importance of social interactions and context in both science and language learning. In addition, researchers have highlighted the important role that multimodal language plays in meaning-making and communication in science. The purpose of this study was to examine the multimodal discursive resources emergent multilingual learners (EMLs) used in their journals on the topic of erosion. Thus, we ask "in what ways do multimodal discursive resources differ as EMLs describe doing an investigation (practices) and learning (content) in response to a writing prompt (What I did-What I learned)?" This research, grounded in an interpretive/constructivist paradigm, examined the journals of 18 EMLs who participated in a summer program where they engaged in the social context of scientific practice. Students used the What I Did/What I Learned (WID/WIL) writing prompt to describe the practices used in the classroom investigations and the knowledge resulting from these investigations. The WID/WIL journal entries were examined using template analysis coding. The template consisted of four major categories: writing, mathematical expressions, manual-technical operations, and setting. Findings indicated that EMLs utilized writing and mathematical expressions to communicate their manual technical operations (practice) and knowledge (content) of erosion. EMLs did not use visual representations as part of their multimodal resources. Implications for science teaching and the use of the WID/WIL as a writing prompt are included.