FAULT TYPES, PLATE BOUNDARIES, AND STRESS IN THE EARTH’S CRUST Have you ever wondered what causes earthquakes and how the Earth's crust moves beneath us? Let’s break it down in simple terms by looking at faults, plate boundaries, and the types of stress that shape our dynamic planet. FAULT TYPES A fault is a crack or fracture in the Earth’s crust where movement has occurred. Faults are responsible for most earthquakes, and they’re classified based on how the rocks move along them. Normal faults