This piece contends that engaging in s c i e n t i f i c a r g u m e n t a tion simultaneously promotes s e c ond l a ngua ge ac qui si t i on t hr ough pur pose f ul and authentic use of English, supports development of science content knowledge, and facilitates socialization into science practices. We explore the learning opportunities embedded within argumentation using a sheltered English immersion s c i e n c e c l a s s r o o m e x a m p l e . Through this examination, w e provide

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... n for designing learning environments for students that promote these types of learning experiences.