The Sea Floor Spreading Theory explains how the ocean floor is formed and changes over time. According to this theory, new oceanic crust is created at mid-oceanic ridges and old crust is destroyed at trenches. This process works like a moving conveyor belt and helps us understand the movement of plates and changes on the Earth’s surface. BACKGROUND During the exploration of the ocean floor during World War II , a large amount of evidence was found regarding the presence of different relief features under the oceans. It was also observed that the temperature is high around a continuous mountain system, known as Mid-Oceanic Ridges . BASIC INTRODUCTION During World War II, sonar radiation was used to map the ocean floor, and magnetic anomalies were also studied. It was found that the ideal ocean floor has certain features, as shown in the diagram below:- → Thus, Harry Hess gave his Sea Floor Spreading Theory in 1960 . According to h...