noun:the solid mineral material forming part of the surface of the earth
The hikers climbed over the large rock.
noun:a piece of stone of any size
He skipped a flat rock across the surface of the lake.
noun:a type of popular music with a strong beat, often featuring electric guitars
His favorite genre of music is classic rock.
noun:someone or something that is extremely reliable or dependable
During the crisis, she was a rock for her entire family.
verb:to move gently back and forth or side to side
She rocked the baby to sleep in a soft chair.
