Estar for physical condition/result
One of the uses of estar (not ser) is to talk about the physical condition of something, someone or a place. This specific use of estar is used for non-permanent conditions; it's seen as a result. Have a look and listen to these examples:
Remember, this specific use of estar is used for non-permanent conditions. For permanent physical descriptions see Ser vs Estar in Spanish: Using ser in Spanish (not estar) to express an essential or permanent characteristic
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