There Are Traces of Oxygen in Mercury's Atmosphere

question 244

Multiple Choice

There are traces of oxygen in Mercury's atmosphere. The source of this is believed to be

• A) the sublimation of polar ice.
• B) the remnants of the primordial solar nebula.
• C) outgassing from within the planet.
• D) a continual rain of ice-coated cometary fragments into the atmosphere of Mercury.

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Definitions:

Call Feature

A provision in a bond or other fixed-income security that allows the issuer to repurchase and retire its bonds before they reach their specified maturity date.

Coupon Rate

The annual interest rate paid by a bond's issuer to its holders, expressed as a percentage of the bond's face value.

Bond Market

A financial market where participants can issue new debt in the form of bonds or buy and sell debt securities, primarily to and from investors.

Coupon

The yearly rate of interest on a bond, denoted as a percentage of the base value.