Question

स्वेज अथवा पनामा नहर का रेखाचित्र बनाकर उसका व्यापारिक महत्व लिखिए।
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Answer 1

\A volcanologist or vulcanologist is a geologist who studies the processes involved in the formation and eruptive activity of volcanoes and their current and historic eruptions, known as volcanology. Wikipedia