1. Scientists map the seafloor by using sonar; the sound waves hit the sea floor and then bounce back.
2. Mapping the seafloor helped lead to the discovery of plate tectonics because scientists first thought the sea floor was flat but mapping the seafloor showed them it wasn't. Then, they started to wonder how they were formed, both on and off land (in water). This wondering led to the discovery of plate tectonics.
2. Mapping the seafloor helped lead to the discovery of plate tectonics because scientists first thought the sea floor was flat but mapping the seafloor showed them it wasn't. Then, they started to wonder how they were formed, both on and off land (in water). This wondering led to the discovery of plate tectonics.