Answer:
Appalachian Mountains and earthquakes
Step-by-step explanation:
- The Appalachian Mountains are a system of the mountain of eastern North America and were formed about 480 million years old. Are at an elevation of alps and Rockies i.e 6,684 feet.
- The mountains reveal a folded thrust marine sedimentary rocks that were formed from the oceanic floor. Today the mountains are more exposed and consist of the weakened core due to the earth's movements.
- More than 2000 earthquakes have been occurred in the past due o the presence of various fault zone such as the Ramapo Fault zone in the north.