Here are potential responses to the natural hazards practice questions: 1. Earthquakes and volcanic eruptions are caused by movement and activity within the earth's plates. At plate boundaries, plates collide, slide past each other or move apart. The friction between plates builds up stress over time and is suddenly released in earthquakes or volcanic eruptions. [3 marks] 2. A divergent plate boundary is where tectonic plates are moving away from each other. [1 mark] 3. Tropical storms form over warm tropical oceans where sea surface temperatures are above 27°C. Convection currents carry warm, moist air upwards which condenses to form thunderstorms. Coriolis force causes the winds to