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:
Projected Benefit Obligation
The present value of estimated future pension benefits owed to employees, based on expected salary increases.
Prior Service Cost
Costs that arise when a pension plan is amended to increase benefits for employee service provided in prior periods, recognized over the service periods of affected employees.
Unrecognized Prior Service Cost
Costs associated with retroactive benefits granted in pension plans, which are not immediately recognized as an expense but are amortized over time.
Years-Of-Future-Service Method
An actuarial technique used to calculate pension benefits, taking into account the expected years of service remaining for an employee.
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