What Evidence Suggests That Enceladus Has Ongoing Geological Activity

question 88

Multiple Choice

What evidence suggests that Enceladus has ongoing geological activity?

• A)Voyager 2 photographed liquid nitrogen geysers 10 kilometers tall.
• B)Lack of impact craters on much of its surface, evidence of ice flows from possible volcanicactivity, and geysers that supply material for the E-ring.
• C)Voyager 1 showed sulfur eruptions all over its pizza-pie colored surface.
• D)Enceladus is located within Saturn's Roche limit, and ready to blow up.
• E)Enceladus undergoes severe tidal stresses from its resonance with Titan.

---

Definitions:

Defined Benefit Pension Plan

A retirement plan where employee benefits are calculated using a formula that considers factors like length of employment and salary history, with the employer bearing the investment risk.

Projected Benefit Obligation

The present value of all the benefits earned by employees, according to their pension plan up to the measurement date.

Amortization of Prior Service Cost

The process of gradually recognizing the costs of benefits earned by employees in earlier periods in the pension expense over the service life of the employees.

Settlement/Discount Rate

The interest rate used in calculating the present value of future cash flows or the rate at which a financial transaction is settled less than its original value.