The International Earth Science Olympiad (IESO), one of the twelve International Science Olympiads, is an annual competition for secondary school students that tests their abilities in disciplines such as geology, meteorology, environmental science, and terrestrial astronomy.
IESO, International Earth Science Olympiad) — ежегодное соревнование, проводящееся среди учащихся средних школ в таких дисциплинах как геология, метеорология, океанография и астрономия.