The [Hamersley] range is one of the oldest mountain ranges on Earth and primarily consists of ancient rock formations, including banded iron formations (BIFs), that are about 2.5 billion years old.
Pentagon (Wikipedia) In geometry, a pentagon (from Greek πέντε (pente) ‘five’ and γωνία (gonia) ‘angle’) is any five-sided polygon or 5-gon. The sum of the internal angles in a simple pentagon is 540°.
