The Appalachian Mountains were formed when the North American ...

[big1devin]

The Appalachian Mountains were formed when the North American continent collided with Africa to form the supercontinent Pangaea over 250 million years ago. What kind of tectonic boundary existed here?
 
  What sort of structural features would you expect to find in this region?
  What will be an ideal response?

Question 2

What are the four factors that influence rock strength? Describe how they will affect the rock when it is under stress.
 
  What will be an ideal response?

[Shshxj]

Answer to Question 1

Answer: Since this is a convergent boundary, expected features would include folds such as anticlines and synclines as well as reverse or thrust faults.

Answer to Question 2

Answer: Higher temperatures make the rocks softer and more able to stretch or become malleable rather than shatter. Confining pressure squeezes rocks, making them harder to break. Certain rock types are more ductile than others, and others are more brittle. For example, rocks with intergrown mineral crystals are more likely to shatter in response to stress, where rocks that are weakly cemented or have zones of weakness are more likely to bend. Finally, time also influences the rocks' response to stress. Stress applied over a long period of time is more likely to result in ductile deformation, while stress applied over a short period of time is more likely to result in brittle deformation.