Why do scientists believe that bluestones at Stonehenge were brought there from a mountain range in wales?

Scientists believe that the bluestones at Stonehenge were sourced from the Preseli Hills in Wales due to geological studies that match the stone composition found at both locations. Additionally, archaeological evidence suggests that these stones were transported over long distances, indicating the significance of their origin. Theories also propose that the bluestones held particular cultural or spiritual value for the builders, prompting their relocation to the site.