Economic geographers typically differentiate between knowledge-intensive, volatile, unstandardized activities, and standardized, routinized production.
Explosive eruptions occur when magma decompresses as it rises, allowing dissolved volatiles (dominantly water and carbon dioxide) to exsolve into gas bubbles.
During mesodiagenesis, dehydration of clay minerals occurs, the main development of oil genesis occurs and high to low volatile bituminous coals are formed.
