Spacecraft Exploring the Moon in the 1990s Found Evidence of Water

question 57

Multiple Choice

Spacecraft exploring the Moon in the 1990s found evidence of water:

• A) as hoar frost on the rims of craters, frozen out during lunar night but quickly evaporating when illuminated by sunlight.
• B) in the depths of the sinuous rilles or valleys, probably the frozen remnants of the rivers that caused the valleys.
• C) as ice in craters near the Moon's south pole.
• D) as permafrost all over the Moon, particularly in the light-colored highlands.

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Definitions:

Internal Rate of Return

A financial metric used to evaluate the profitability of potential investments, calculated as the discount rate that makes the net present value of all cash flows from a particular project equal to zero.

Net Present Value

An economic metric that evaluates the gap between the present value of cash inflows and outflows across a designated period.

Cash Flow Estimates

Projected amounts of cash inflows and outflows over a certain period that help businesses plan for investments, operational needs, and debt repayment.

Payback Rule

A capital budgeting technique that calculates the time required to recoup the cost of an investment, focusing on cash flows without considering the time value of money.