Below is a digital elevation model of Mars.What process is responsible for creating the Valles Marineris? 
Definitions:
Perfectly Competitive
A market structure characterized by a large number of small firms, all selling identical products, where no single firm can influence the market price.
Monopoly Price
The price a monopolist sets, which is typically higher than both marginal and average costs, maximizing profits due to lack of competition.
Remarkable Healing
An extraordinary or exceptional process of recovery from an injury or disease.
Reaction Function
Describes how one player in a game reacts to the strategy chosen by another player, often used in the study of oligopoly markets.
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