The graph below plots the escape velocity of each planet along the vertical axis and its surface temperature along the horizontal. The lines plotted in the figure are the speeds of the fastest gas particles as a function of temperature for various gases. Which of the gases plotted in the diagram could be retained in the atmosphere of Mars? 
Definitions:
Contract Language
The specific wording and terms used in contracts that define the rights, obligations, and procedures for the parties involved.
Beck Rights
Rights stemming from a U.S. Supreme Court decision that allow union members to object to their dues being used for political or other non-bargaining activities and to pay only that portion of dues necessary for contract negotiations and administration.
Agency Shop Agreements
Labor agreements that require employees to pay union fees even if they are not union members as a condition of employment, supporting the union's bargaining efforts on their behalf.
Grievance Arbitration
A procedure used in labor relations to resolve disputes or grievances between employees (or their representatives) and employers through the intervention of a neutral third party or arbitrator.
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