Linked from
The 18 pages that link to Geology, each with the reason it gives.
Mohs scaleNarrower topic: The scale is used to compare minerals encountered in geological work.
Munsell color systemRelated: Geologists use Munsell references to record rock and sediment colors.
Surface miningNarrower topic: Deposit geometry and surrounding rock influence surface mine design.
Big HistoryRelated: Geology anchors the planetary part of the connected narrative.