Answer:Here are 10 active faults in the Philippines, categorized by island group: LuzonPhilippine Fault: Runs the length of Luzon, from the Cagayan Valley to the Bicol region. It's responsible for many major earthquakes in the Philippines.Manila Trench: Located off the coast of Manila Bay, it's a subduction zone where the Eurasian Plate dives under the Philippine Sea Plate.Casiguran Fault: Located in the northeastern part of Luzon, it's a major fault that has caused significant earthquakes in the past.Valley Fault System: A complex system of faults that runs through Metro Manila and surrounding areas. It's a high-risk zone for earthquakes.Marikina Valley Fault: Part of the Valley Fault System, it runs through the Marikina Valley and is known for its potential to generate destructive earthquakes. VisayasCentral Visayas Fault: Runs through the central portion of the Visayas, extending from Cebu to Negros.Negros Trench: Located off the coast of Negros Island, it's a subduction zone where the Eurasian Plate dives under the Philippine Sea Plate. MindanaoCotabato Trench: Located off the coast of Mindanao, it's a subduction zone where the Eurasian Plate dives under the Philippine Sea Plate.Davao Fault: A major fault that runs through Davao City and surrounding areas. It's known for its potential to generate significant earthquakes.Surigao Fault: Located in the northeastern part of Mindanao, it's a major fault that has caused significant earthquakes in the past. Important Note: This is not an exhaustive list, and there are many other active faults in the Philippines. It's crucial to remember that the Philippines is a seismically active region, and earthquakes are a significant risk.