Solid, Matter that keeps its own shape and does not change shape easily., Liquid, Matter that takes the shape of the container it is in., Gas, Matter with no shape that spreads out and moves through the air., Melting, When a solid changes into a liquid when heat is added., Freezing, When a liquid changes into a solid because heat energy is removed., Boiling Point, The temperature where a liquid changes into a gas., Melting Point, The temperature where a solid changes into a liquid., Evaporation, When liquid water is heated and changes into water vapor (gas)., Condensation, When water vapor cools and changes back into liquid water., Precipitation, When water falls from clouds as rain, snow, sleet, or hail., Water Cycle, The continuous movement of water on, above, and below Earth’s surface., Runoff, Water that flows over land into rivers, lakes, and oceans., Collection, When water gathers in oceans, lakes, rivers, or underground, The Sun, The main source of energy that drives the water cycle., Heat Energy, Energy that raises temperature and causes changes in matter.

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