Meaning: This means that asteroids are made up of rock.
Choice of Words: Asteroids, are, rocky, bodies are all common English words. Rocky means made of rock.
Alternative Expressions
Asteroids are made of rock.
Meaning: Asteroids are composed of rock, which is a hard material.
Choice of Words: An asteroid is a small, rocky object that orbits the Sun. Made of means that something is composed of a particular material. Rock is a hard material that forms the Earth's crust.
Asteroids are rocky objects in space.
Meaning: Asteroids are small, rocky objects that move around the Sun in space.
Choice of Words: An asteroid is a small, rocky object that orbits the Sun. Rocky means made of rock, which is a hard material that forms the Earth's crust. Objects is a general term for things that have a physical form. Space refers to the vast expanse beyond Earth's atmosphere.