it only happensonce every 7 years
Answer:
Freezing and condensation
Explanation:
Because they are exothermic, they release energy
Answer:
Self-reduction is a reaction in which no external reducing agent is required. It is called self-reducing because copper oxide itself reduced the copper sulfide to give copper and sulfur dioxide.
Answer:
I think this is how you draw it, but I'm not entirely sure.
Explanation:
Screenshot below: