formed
v.v. to make something start to exist or to give something a specific shape. You use it when parts come together to create a whole group or object.
v. to bring into existence or give a particular shape to something; to constitute or make up a whole. Transitive in most active contexts, though often appearing in the passive to describe composition.
The students formed a circle on the grass.
After years of working together, the two scientists formed a close friendship and a successful business partnership.
The cooling lava gradually formed hexagonal columns that eventually became a famous geological landmark along the coast.
The verb is transitive and takes a direct object; it is frequently used in the passive voice to describe what something is made of.