A large triangular structure built in ancient Egypt., Pyramid, The smallest unit of matter.  , Atom, The force that pulls objects toward Earth.  , Gravity, A structure built to cross over obstacles.  , Bridge, A system of words used for communication. , Language, A system for organizing days and months.  , Calendar, An object that attracts iron and steel.  , Magnet, A vast body of saltwater covering most of Earth.  , Ocean.

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