Answer:When different types of matter combine: * Solid + Solid: Usually stay separate unless processed (melted, ground). * Solid + Liquid: Can dissolve (sugar in water) or just mix/settle (sand in water). * Solid + Gas: Gas might stick to the surface. * Liquid + Liquid: Can mix completely (juice and water) or separate into layers (oil and water). * Liquid + Gas: Gas can dissolve (soda) or bubble/evaporate. * Gas + Gas: Always mix completely.Why it's important: It helps us understand how the world works (cooking, weather), how to create new things (materials, medicines), and for safety.
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