frozen water - ice, fresh water - water without salt , salt water - water with salt , pollution - harmful materials to thee ecosystem, brackish water  - mixture of fresh and salt water , salinity - how much salt is in the ocean, ground water - runoff that flows underground, watersheld - the land area that supplies water to a river system, turbidity - a measurement of how clear the water is , glacier - a large mass of moving ice and snow on land ,

hydrosphere

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排行榜

視覺風格

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切換範本

恢復自動保存: ?