Glossary beginning with M
- Maastrichtian
- Macrofossil
- Macrophytes
- Mafic
- Mafic Magma
- Magma
- Magma Chamber
- Magnetic Reversals
- Magnetite
- Magnetometer
- Magnitude
- Mantle
- Manzanita
- Marble
- Marmot
- Mass Wasting
- Mast crop
- Mechanical Weathering
- Medial moraine
- Mesa Top
- Mesic
- Mesotrophic
- Mesotrophic Era
- Metaconglomerate
- Metamorphic Rock
- Metapopulation
- Microclimate
- Microfossil
- Microhabitat
- Micrometer
- Midden
- Migmatite
- Miocene
- Mississippian
- Mitigation
- Mixed conifer
- Mojave Desert
- Monocline
- Monoculture
- Montane Ecosystem
- Monzogranite Rock
- Moose
- Moraine
- Morphology
- Mosaic
- Mottling
- Mountain Goat
- Mountain Lion
- Mule Deer
- Muscovite
- Mélange
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