About atoms and molecules plz!?

Atoms: They are the smallest part of matter that may or may not exist independently. When atoms come together they form molecules.

Molecules: Many atoms combined either chemically or naturally form molecules. They are the smallest unit of matter that exist independently.

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igneous rocks also form where plates converge. the subducting plate melts as it sinks into the crust of the earth, and the melt rises into the overriding plate forming volcanoes. metamorphic rocks are formed mainly in the lithosphere, wherever there is high pressure and high temperature. -woods