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## Water sources Water sources are not evenly distributed on Earth. Water can move from one store to another. ### Freshwater Freshwater is used directly and is found in glaciers, rivers, lakes, soil, and groundwater. ### Saltwater Saltwater is found in the oceans. The Pacific ocean is the la...

## Water sources Water sources are not evenly distributed on Earth. Water can move from one store to another. ### Freshwater Freshwater is used directly and is found in glaciers, rivers, lakes, soil, and groundwater. ### Saltwater Saltwater is found in the oceans. The Pacific ocean is the largest body of water. ### States of Matter * **Solid:** freezes at cold temperatures * **Liquid:** flows freely, set shape but no fixed volume * **Gas:** boils, steam ## Resource Management Humans can obtain materials from nature for their own use. This is called a human-centered view. Nature-centered views see nature as valuable in itself. ## Sustainable Use of Resources We should ensure that natural resources are still available for future generations. ### Reducing Our Impact * **Reuse:** Reuse items to reduce the consumption of new resources. * **Reduce:** Use less. For example, reduce the amount of water used when taking a shower. * **Recycle:** Process used materials to create new products. For example, recycle plastic bottles. * **Recover:** Clean up waste and resources and restore them for later use. * **Refuse:** Refuse to use materials or products that can't be reused or recycled. ## Sustainable Management of Water ### Hydrologic Cycle The hydrologic cycle is a sequence of processes that occur to ensure that water is naturally replenished on Earth. ### River Ecosystems River Ecosystems are dependent on water to survive. Food chains show relationships between organisms as energy is transferred through food. ### River Pollution Harmful substances can enter water bodies. * **Leaks:** Leaks from landfills * **Dumping:** Conveniently dumping rubbish ### Excess Fertilizers Excess fertilizers from farms can be washed into water bodies, leading to rapid algae growth. ### Floods Floods are an overflow of water, onto what is normally dry land. ### Droughts Droughts are a long period of little to no rainfall in a specific area.