Petrology=بترولوجية
- ONLINE ETYMOLOGY DICTIONARY:
- petrology (n.)
- petro- (1)
- before vowels petr-, word-forming element used from 19c., from comb. form of Gk. petros "stone," petra "rock" (see petrous).
- -ology
- word-forming element indicating "branch of knowledge, science,"
now the usual form of -logy.
Originally used c.1800 in nonce formations (commonsensology, etc.),
it gained legitimacy by influence of the proper formation in
geology, mythology, etc., where the -o- is a stem vowel in the
previous element.
WIKIPEDIA
Petrology (from the Greek πέτρα, petra, "rock" and λόγος, logos, "study") is the branch of geology that studies the origin, composition, distribution and structure of rocks.
Lithology was once approximately synonymous with petrography, but in current usage, lithology focuses on macroscopic hand-sample or outcrop-scale description of rocks, while petrography is the speciality that deals with microscopic details.
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