Click Next 45. Describe the process of sea-floor spreading. square 46. How does new ocean floor and oceanic crust form? square 47. square 48. What is a fault? square 49. Explain how earthquakes are formed. square 50. Which two plates meet at the San Andreas Fault? square Click Plates Interactions Challenge Case 1: Africa What is happening at the plate boundary where the African and the Arabian Plate meet? square 52. What geological event is most likely to occur at this plate boundary in the future? square Case 2: New Zealand 53. What is happening at the plate boundary where the Australian and the Pacific Plate meet? square

45. Sea-floor spreading involves magma rising at mid-ocean ridges, forming new crust. ### 46. New ocean floor forms as magma solidifies at divergent boundaries. ### 48. A fault is a fracture in Earth's crust with relative movement. ### 49. Earthquakes form from sudden movement along faults due to stress. ### 50. The Pacific Plate and North American Plate meet at the San Andreas Fault. ### Case 1: Divergence at the African-Arabian boundary forms the Red Sea. ### 52. Further widening of the Red Sea is likely. ### Case 2: Convergence at the Australian-Pacific boundary causes subduction and seismic activity. Explanation 1. Describe Sea-Floor Spreading Sea-floor spreading occurs at mid-ocean ridges where tectonic plates diverge. Magma rises from the mantle, solidifies, and forms new oceanic crust. 2. Formation of New Ocean Floor and Crust New ocean floor and crust form as magma emerges at divergent boundaries, cools, and adds to the oceanic plate. 3. Define a Fault A fault is a fracture in Earth's crust where blocks of land move relative to each other. 4. Formation of Earthquakes Earthquakes occur when stress on a fault line exceeds friction, causing sudden movement and energy release. 5. Identify Plates at San Andreas Fault The Pacific Plate and North American Plate meet at the San Andreas Fault. 6. Interaction at African-Arabian Plate Boundary The African and Arabian Plates are diverging, leading to the formation of the Red Sea. 7. Future Geological Event at African-Arabian Boundary Continued divergence may lead to further widening of the Red Sea. 8. Interaction at Australian-Pacific Plate Boundary The Australian and Pacific Plates converge, causing subduction and seismic activity near New Zealand.