Alphabetical list of glossary terms
- radar
- radian
- radiation
- radioactivity
- radioisotopes
- radiosonde
- rain gauge
- rainshadow
- Ramsay, William
- random walk
- rarefactions
- ratio
- Ray, John
- Rayleigh surface wave
- reactant
- reaction
- reaction rate
- recessive
- record
- recycle
- redshift
- reflect
- refraction
- regression
- relative humidity
- relativistic
- relativity
- Remak, Robert
- repel
- replication
- reproductive isolation
- research
- respiration
- Resting membrane potential
- retrospective
- Richardson, Lewis Fry
- riparian
- RNA
- rookery
- rough endoplasmic reticulum
- rover
- Royal Society of London
- Rutherford, Ernest
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