In the figure below,what is the approximate speed of S-waves at the 670km discontinuity? 
Definitions:
Social Forces
Social forces refer to the societal structures and cultural norms that influence individuals' behaviors, actions, and opportunities within a society.
Love
An intense feeling of deep affection towards someone or something, characterized by emotional attachment and strong personal connection.
Marry
is the legally or formally recognized union of two people as partners in a personal relationship.
Marriage
A legally and socially sanctioned union, usually between two people, that is regulated by laws, rules, customs, beliefs, and attitudes that prescribe the rights and duties of the partners.
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