fluorspar - front of thrust
- Fredericksburg group
- Fredericksburgian
- free
- free air
- free air gravity
- free caving
- free cheek
- free coal
- free face
- free falling jet
- free fluid index
- free gas
- free gold
- free gold dominates in the sample
- free level
- free metamorphism
- free miner
- free oil
- free open-textured sand
- free phytoplankton
- free surface wave
- free water
- free water salinity
- free-air anomaly
- free-air anomaly map
- free-air correction
- free-air gravity anomaly
- free-air gravity field
- free-air gravity profile
- free-ash coal
- free-boundary reflection
- free-burning coal
- free-caving
- free-crushing
- free-draining
- free-falling
- free-falling mass
- free-falling object
- free-falling-mass experiment
- free-falling-mass measurements