Alphabetical list of glossary terms
- Oak Ridge National Laboratory
- observation
- oceanic crust
- oceanographer
- Ockham's Razor
- Oersted, Hans Christian
- Okazaki fragment
- Oldenburg, Henry
- oligotrophic
- optical
- optimal foraging
- order of magnitude
- organelle
- organic
- organic chemistry
- organic molecule
- organism
- ORNL
- Osborn, Henry Fairfield
- osteological
- outbreak
- outcome
- outlier
- ovule
- oxidation state
- ozone
- ozone layer
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