Questions with the keyword 'oxygen'

• Why do we (on earth) have oxygen, but other planets do not? by kittykat1999 to Mike, Pip, Tianfu, Tim, Tom Comments: (No comments so far )
• why does sulphur + oxygen become sulphur dioxide, and not sulphur oxide? by misaki to Mike, Pip, Tianfu, Tim, Tom Comments: (So far, one comment )