Alphabetical list of glossary terms
- radar
 - radian
 - radiation
 - radioactive decay
 - 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 age
 - 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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