[Solved] Tony is playing with his ball, and Pepper is playing with her doll, but they are each watching what the other is doing. Tony and Pepper are most likely involved in A) cooperative play. B) parallel play. C) simple social play. D) prosocial behavior. Cleavage: A property of minerals that allows them to break along smooth, flat surfaces, determined by the mineral's crystal structure. Columnar Joints: Natural formations resulting from the cooling and cracking of volcanic rock into nearly hexagonal columns. Finely Crystalline: Describes a rock texture that consists of small, closely-packed crystals not easily visible to the naked eye. Calcite: A common mineral form of calcium carbonate, critical in the formation of limestone and marble, and involved in many geological processes.