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Rivers and ravines are earth words. They begin with the letter r.
Radiation, radium and radon are science words. They begin with the letter r.
Yangchuanosaurus.
Some science words that begin with the letter P are: protein, protease, probiotic, permeable, phylum. Additionally, the branch of science known as physics starts with the letter P.
Ytterbium and Yttrium are chemical elements. They begin with the letter Y.