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:
Short-Term Obligations
Financial liabilities or debts that are due to be paid within a short period, typically within a year.
Financial Ratios
Quantitative measures derived from a company's financial statements used to assess its financial health, performance, and stability.
Liquidity Ratios
Financial metrics used to determine a company's ability to pay off its short-term debts with its liquid assets, critical for assessing financial health.
Asset Management Ratios
Financial metrics that assess how efficiently a company is using its assets to generate revenue, including turnover ratios for receivables, inventory, and assets.
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