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This investigation provides learners with a hands-on activity that simulates the changing relationship of surface areas-to-volume for a growing cell.

In this activity, learners create models of erosion and floods and learn to recognize both in their environment.

In this activity, learners explore the "nuts and bolts" of gene chips.

In this activity, two groups of learners create two separate landform models out of clay (mountains and valleys).

In this activity, learners observe colors in the flame of a burning candle to explore connections between matter, light, color and temperature -- basic concepts of matter and energy.

In this activity, learners construct a 3-D paper model depicting how histone, acetyl and methyl molecules control access to DNA and affect gene DNA expression.

In this activity, learners create a model using metric measuring tapes and atmosphere composition data.

In this activity, learners simulate a multistage rocket launch using party balloons, fishing line, straws, and a plastic cup.

In this activity, learners use sand and ice cubes to create a model of permafrost and the effects of the ice melting through the surface.

In this activity, learners string a line across the room and build cable cars that can move from on end to the other.

In this activity, learners take on the role of various parts of the cell in order to model the process of protein synthesis.