Simplify the following text for a Grade 15 native English-speaking person.
Original: Archipelagos are often volcanic , forming along island arcs generated by subduction zones or hotspots , but there are many other processes involved in their construction , including erosion , deposition and land elevation .
Simplified: Archipelagoes are often volcanic , forming along mid-ocean ridges or hotspots , but there are many other processes involved in their construction , including erosion , deposition , and land elevation .