Using the image below,explain why the P-wave velocity drops drastically at the core-mantle boundary.Also,explain why the P-wave velocity speeds up at the inner core-outer core boundary. 
Definitions:
Video Adapter
A hardware device or component that connects to a computer or other display source to generate and output video signals to a display device such as a monitor or projector.
DVI
Digital Visual Interface, a video display interface used to connect a video source to a display device, like a computer monitor.
HDMI
High-Definition Multimedia Interface, a digital interface for transmitting audio and video data from an HDMI-compliant source to a compatible computer monitor, video projector, or digital television.
ESATA
External Serial Advanced Technology Attachment, a standard for external drive interfaces, offering fast data transfer rates for external storage devices.
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