magnetic resonance logging - mean depth
- magniphyric
- magnitude
- magnitude of faulting
- magnocalcite
- magnochromite
- magnocolumbite
- magnoferrite
- magnomagnetite
- magnophyric
- magnophyric structure
- magnussonite
- Magosian
- maidenhair
- maigre
- mail shell
- main
- main adit
- main air line
- main air roadway
- main angle
- main bang
- main base
- main bottom
- main camp
- main channel
- main conveyer
- main crater
- main crosscut
- main dam body is filled by unconsolidated deposits of the moraine
- main deep
- main drift
- main entry
- main fan
- main fault
- main field polarity reversal
- main flood
- main floor
- main fracture
- main gallery