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In this activity, learners shrink the scale of the vast solar system to the size of their neighborhood.

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 a classic exercise for visualizing the scale of the Solar System.

In this hands-on and feet-on excursion, learners take a science walk to visualize the planet's immense size and numerous structures, without the usual scale and ratio dimensions found in most textbook

This is an activity (located on page 4 of the PDF under Surface Area Activity) about surface area and reactivity.

In this outdoor biology and math activity, learners estimate the size of a population of organisms too numerous to count.