Give reason: Water is considered a renewable resource on Earth, Replaced naturally through the water cycle, Give reason: Most of the fresh water on Earth cannot be used for drinking, Most is frozen in glaciers, What happens if: People don't conserve fresh water, Water scarcity increases and supplies run out, What happens if: Plants can't get carbon dioxide gas from the air, Photosynthesis stops and plants die, What happens if: Factory waste leaks into an upstream tributary, Pollution spreads downstream to connected waters, Earth's system that consists of a mixture of gases, Atmosphere, Transport of small rock particles from place to place, Erosion, Most of Earth's surface is covered by what type of water, Salt water, Small water bodies flowing into bigger rivers are called, Tributaries, The word Hydro means, Water, Coastal area that disappears underwater at high tide, Intertidal zone, Example of a saltwater lake in Egypt: Lake, Bardawil, Freshwater forms about what percent of Earth's total water, 3.5%, Restricting human access to natural resources is called, Preservation, In a water filter, use sand, cotton, and what to clean water, Charcoal.

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