A discussion of the use of science activities as a technique for second language instruction focuses on its application in both immersion and more traditional pull-out programs in the elementary school. First, a rationale for the use of hands-on science experiences in grade school second language classes is presented, noting the value of the emphasis on content and evidence in the literature supporting the use of science activities for language development. Second, a four-step procedure for the introduction of vocabulary and structures that leads the learner carefully through the stages of listening comprehension to speech production is presented and illustrated in a lesson plan. Brief descriptions of viable options for science lessons and a list of print resources are also included. (MSE)