cobblestone

"The ship used heavy stones as ballast to keep it stable in the water. "

"The divers encountered a huge school of mackerel."

"The old stone wall around the park was very tall. "

"Occasionally rivers overflow their banks and cause floods."

"The carpenter rounded the edges of the table."

"He charmed her with his dashing tales of his days as a sailor."

"The workers are paving the driveway with new stones. "

"The intricate making of the model airplane showcased the student's skill. "

"Asphalt, composed of oil and sand, is a widely used material for roads."

"The old European city was charming, with narrow streets paved with cobblestones. "

"The smooth transition between classes made it easy to get to my next lesson. "

"The cargo ships sailed into the harbor, carrying containers filled with goods. "