Analyze these two photomicrographs of ice crystals (snowflakes) by William Bentley (Fig. A3.2.5). 1. Both ice crystals have the same number of arms that radiate out from the center. How many arms do ice crystals have? 2. There are seven different crystal systems: triclinic, monoclinic, orthorhombic, tetragonal, trigonal, hexagonal, and cubic. Using the number of arms on a snowflake as a hint, what crystal system do ice crystals belong to? What is the basis for your interpretation? 0.1 mm 3. Which of the crystal forms shown in Fig. 3.5 or crystal habits shown in Fig. 3.6 do you recognize in the ice crystals? 4. Why do you think ice crystals do not all have the same shape? Figure A3.2.5

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