What are the 3 most common elements in the mantle?

Could you please clarify what you mean by "mantle" in this context? It's not a term I'm familiar with in the field of cryptocurrency or finance. Are you referring to a specific aspect of these areas, or is this a different subject altogether? If you could provide more details or clarify the question, I'd be happy to assist you. For instance, if you're asking about elements in blockchain technology or components of a financial system, I can offer insights based on those areas. But without further information, it's difficult to provide an accurate answer.