Pangaea 2

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  • But I was missing quantitative data, which made the other scientists think I was crazy. Until Henry Hess...
  • Hi! I'm Henry Hammond Hess a navy official, who came up with seafloor spreading
  • One day I was on my navy ship during my free time and used my sonar and heard the ocean floor. Back then sonar was new technology and I discovered oceans were shallower in the middle.
  • My theory became known as the sea-floor spreading theory: the process by which new oceanic crust forms along a mid-ocean ridge making the older crust move away from the ridge
  • Now scientists had quantative data!
  • But how do Wegner's and Hess's theories relate to the continental drift theory?
  • My theory became known as the sea-floor spreading theory: the process by which new oceanic crust forms along a mid-ocean ridge making the older crust move away from the ridge
  • Hi! This is where I come in 2016, Saira Naeem a student scientist. When seafloor spreading occurs it is evidence to show the continents are moving because it causes a process called convection currents. Convection currents carry heat from the lower mantle and core to the lithosphere.
  • Seafloor spreading occurs on divergent boundaries, where the crust turns more plastic and less dense. A mountain can be made or an elevated area on the seafloor.
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