Divide students into groups of four. Pass out one copy of the Powers of Ten 11 x 17 Poster

to each group, or a smaller version as a handout. Give one copy of 2.2 Powers of Ten Cards to each group. Each individual student should get about six cards.

- Ask students to place their cards on the correct scale on the poster—large scale, macroscopic scale, microscopic scale, or atomic-molecular scale. Tell students they can use the interactive websites and discuss among themselves to determine the scale each card should go on.
- Have students work in groups for about 10-20 minutes, placing each card into one of the four categories.

Ask students to think of examples of similar systems or objects (plant, people, water, fuel, fire, pollen) at different scales (large, macro, micro, atomic-molecular).