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Elements commonly occur on earth as their oxides chiefly because of:

AOxygen in the air
BCurrents in the sea
CHeat from volcanoes
DLight from the sun
Answer & Solution
Correct answer: A. Oxygen in the air
1. Many elements react with the oxygen in the air. 2. Over time they end up combined with it. 3. So atmospheric dioxygen is the principal reason. _Source: syllabus Chemistry Part II, Unit 8, Redox Reactions._
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