Transparent - You can see straight through an object because light can pass through it completely, Opaque - you can't see through it because it blocks all light, Rigid - something is stiff and doesn't bend easily, Waterproof - something is made so that water cannot get through it, Flexible - to be able to bend easily without breaking, Durable - something is strong and built to last a long time,

Key Vocab for properties of materials

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