Evaporation - When a liquid changes into a gas, like a puddle drying up., Condensation - When gas turns into a liquid, like water droplets on a cold glass., Melting - Melting: When a solid turns into a liquid, like ice turning into water., Freezing - When a liquid turns into a solid, like water turning into ice., Boiling - When a liquid gets so hot that it turns into gas, like water bubbling on the stove., Melting point - The temperature when something starts to melt, like when ice melts at 32°F., Boiling point - The temperature when something starts to boil, like water boiling at 212°F., Solid - Matter that has a shape and doesn’t flow, like a rock., Liquid - Matter that flows and takes the shape of its container, like water, Gas - Matter that spreads out and fills the space it’s in, like air., Molecular structure  - The way tiny parts of matter (molecules) are arranged., Volume - The amount of space something takes up., Mass - How much matter is in something, like how heavy it is., Molecule - The smallest part of a substance that is still that substance, made of two or more atoms joined together.,

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