Sectored plate snowflake, light micrograph. Snowflakes are ice crystals that form in air that has a temperature near the freezing point of water. If the air is calm, then a symmetrical, hexagonal snowflake can form. The two main growth patterns observed are faceting and branching. When growth is fast and unstable, branching patterns create a dendritic snowflake. Slower growth allows the straight lines and hexagonal shapes of the sectored plate snowflake seen here, which has some star-shape elements.

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TOP25469210

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達志影像

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RM

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須由TPG 完整授權

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