Which was not included in the support for Harry Hess's hypothesis of sea-floor spreading? earthquake patterns in subduction zones the age of the ocean floor rock granitic rock in the ocean floor magnetic strips in ocean floor rock

Granitic rock in the ocean floor was not included in the support for Harry Hess's hypothesis of sea-floor spreading.

Explanation:

Separation of the ocean floor which leads to the expansion of the ocean is called as sea-floor spreading. By this process there is formation of oceanic crust that are formed by volcanic activity along with the mid-oceanic ridge. Rock are basaltic and dense in nature. By this theory, it is suggested that the rock which are present near the mid-oceanic ridge are younger and the rock which are far from them are older than them. Plate tectonic movement is the cause for the sea-floor spreading.