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The Use of Multiple Representations and the Social Construction of Understanding in

(2000). " The use of multiple representations and the social construction of understanding in chemistry ". In M. Jacobson & R. Kozma (eds.), Innovations in science and mathematics education: Advanced designs for technologies of learning (pp. 11-46). Much that is of interest to the scientific community are phenomena that exist at scales beyond our temporal, perceptual, or experiential limits. Whether the phenomenon is cosmological, geological, biological, or chemical, our window on the world is really very small. For example, it is estimated that the universe has taken 15 billion years to evolve to its current state from the primordial Big Bang. It has taken the Earth's surface about 200 million years to form the current continents from the supercontinent Pangaea. Our early huminid ancestors began their distinct evolutionary path about 7.5 million years ago. Obviously, changes on these temporal scales are not directly accessible to us within a life time of 70