What are the two most abundant elements in earth’s crust? ?

Oxygen is the most abundent... followed by silicon ...
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Silicon and  oxygen and the third one is aluminum.

2cool and cold temperature unless its an ever green tree 

Africans learned what the europeans wanted them to learn. instead of learning about african history and current information that could and would them they learned solely what europe wanted them to. and not everyone received the same education, some received better and others none.