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Contents of 12.2 What is the evidence that plates are rigid?

12.2 What is the evidence that plates are rigid?

• Distribution of mountain belts
• In similar fashion, deformation should reveal mountains along boundaries. Is this the case?
• By and large, yes
• Some mountain belts have little/no earthquake activity and no active volcanism.
• E.g., Appalachian Mts. have fold features that indicate that perhaps they were former subduction systems.