Geosphere, All the solid parts of Earth — rocks, soil, landforms, and the ground beneath our feet., Hydrosphere, All the water on Earth — oceans, rivers, lakes, groundwater, glaciers, and water vapor., Atmosphere, The layers of air and gases surrounding Earth., Biosphere, All living things on Earth — plants, animals, and people., System, A group of parts that work together., Interaction, When two things affect or change each other., Water Cycle, The continuous movement of water on Earth through evaporation, condensation, precipitation, and collection., Evaporation, The process of a liquid turning into a gas (water → water vapor)., Condensation, When water vapor cools and changes back into liquid water., Precipitation, Any water that falls from the sky — rain, snow, sleet, hail., Groundwater, Water stored under the Earth’s surface in soil and rock spaces., Runoff, Water that flows over the land surface into streams, rivers, lakes, or oceans., Reservoir, Any place where water is stored, for example oceans, lakes, rivers, glaciers, or underground stores., Freshwater, Water that is not salty, found in lakes, rivers, glaciers, and groundwater., Water Quality, How clean or safe water is for people, animals, and ecosystems., Mixture, A combination of two or more substances that can be separated by physical means., Solution, A special kind of mixture where one substance dissolves evenly in another (for example, salt dissolved in water)., Filtration, A method to separate solids from liquids by passing the mixture through a filter., Pollution, Harmful substances that make the air, water, or land dirty and unsafe., Conservation, Actions that save or protect natural resources so they last longer and remain healthy..

Unit 4

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