Modifiers matching formation:

• interesting,
• volcanic,
• ideological,
• geologic,
• geological,
• stable,
• national,
• unstable,
• social,
• active,
• exterior,
• unique,
• porous,
• earthen,
• natural,
• soft,
• spiritual,
• underwater,
• conical,
• underground,
• conceptual,
• tropical,
• pointed,
• spatial,
• undesirable,
• beautiful,
• unusual,
• structural,
• unconsolidated,
• offer,
• virtual,
• geophysical,
• defensive,
• hard,
• political,
• major,
• quaternary,
• diverse,
• homogeneous,
• key,
• rocky,
• moving,
• surrounding,
• star,
• salt,
• particular,
• geographical,
• hollow,
• ancient,
• large,
• impermeable,
• galactic,
• special,
• massive,
• harder,
• vertical,
• standard,
• monolithic,
• weak,
• regular,
• tall,
• acid,
• territorial,
• christian,
• cultural,
• small,
• impersonal,
• softer,
• sedimentary,
• deep,
• molecular,
• pathologic,
• sticky,
• historical,
• geographic,
• rare,
• cambrian,
• morbid,
• common,
• up,
• individual,
• sacred,
• dense,
• intricate,
• plastic,
• medium,
• polygonal,
• impervious,
• mental,
• complex,
• discrete,
• pedestrian,
• igneous,
• uniform,
• nearby,
• siliceous,
• separate,
• strange,
• typical,
• popular,
• artistic,
• thick,
• permeable,
• solid,
• coastal,
• symbolic,
• military,
• elastic,
• organized,
• smaller,
• traditional,
• subsurface,
• geometric,
• formal,
• impressive,
• crystalline,
• glacial,
• larger,
• abrasive,
• strong,
• organic,
• past,
• calcareous,
• internal,
• driving,
• personal,

Simple categories matching subsurface:

• excavation,
• sorbent,
• detail,
• structure,
• material,
• component,
• condition,
• utility,
• system,
• feature,
• installation,
• property,
• platform,
• void,
• variation,
• separation,
• obstruction,
• process,
• object,
• cavity,
• change,
• reservoir,
• imperfection,
• defect,
• attribute,
• information,
• resource,
• layer,
• fluid,
• body,
• construction,
• liquid,
• area,
• deposit,
• industry,
• variable,
• facility,
• artifact,
• measure,
• stratum,
• soil,
• mineral,
• item,
• data,
• quantity,
• drain,
• rock,
• formation,
• anomaly,