Using the image below,explain why the P-wave velocity drops drastically at the outer core-mantle boundary.Also,explain why the P-wave velocity speeds up at the inner core-outer core boundary. 
Definitions:
Cross-culturally
Pertaining to or involving comparison between two or more different cultures or cultural areas.
Emotional Expression
The outward display of emotions or feelings through facial expressions, gestures, and speech.
Amygdala
A component of the brain's limbic system involved in emotion regulation, memory processing, and decision-making.
Emotion
A multifaceted emotional condition that leads to both physical and mental alterations, affecting one's thinking and actions.
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