The crowns of upper and lower Egypt were combined because

King Menes combinded upper and lower Egypt. He decidd to combine upper and lower Egypt and the crowns.

he combined upper and lower Egypt

The red crown. Part's of Lower Egypt were between Memphis and northwards towards the Nile Delta.

The Red Crown.That is until Menes (MEE-nes), also known as king Narmer united upper and lower Egypt.Then with them combined the crown was also combined...!

when are atoms are more stable existed at a lower energy state in a combined form

one way is king Menes. he combined the upper Egypt crown with the lower Egypt crown to create the double crown.