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In this demonstration, learners compare the relative sizes and masses of scale models of the planets as represented by fruits and other foods.

This is an activity (on page 2 of the PDF under Surface Area Activity) about surface area to volume ratio.

In this game, learners explore the different sizes of things in the world. In this Twister-like game, learners must place a hand or foot on a circle of the right scale - macro, micro, or nano.