Conductor - Lets heat or electricity pass through easily, Insulator - Stops heat or electricity from passing through, Thermal conductor - Lets heat move through it quickly, Reversible change - A change that can go back to how it was before, Irreversible change - A change that cannot go back to how it was before, Physical change - A change in how something looks, but it stays the same material, Chemical change - A change that makes a new material and cannot be undone, Gravity - A force that pulls things down to the ground, Friction - A force that slows things down when they rub together, Force - A push or a pull that can move or stop something, Density - How heavy something is for its size, Circuit - A path that electricity can move through, Electricity - A type of energy that powers things like lights or TVs, Reflection - When light bounces off something like a mirror, Refraction - When light bends as it moves through water or glass, Asteroids - Small rocky objects that move around the sun, Planet - A large round object in space that moves around the sun, Solar system - The sun and all the things that move around it, Properties (of materials) - The features or qualities of a material, like if it’s hard or soft, Heating and cooling - What happens when something gets hotter or colder,

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