crack  - a thin line that appears that shows that something is broken, film  - a very thin layer of something on a surface, minimize  - make a quantity as small as possible, pressure  - the force that a liquid or gas makes when it is inside a closed area, surface tension  - the natural force a liquid has that holds it together where it meets the air, rigid  - unable to change shape or position, mechanically stable  - unlikely to change shape or break because it has a strong structure,

B2-C1 Hexagons ex2B

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