The essential difference between the brand new theories away from dish tectonics and you can continental float is the fact that the latter believed continents moved from the ocean floors. Centered on plate tectonics, both continents and sea flooring was integrated parts of new “damaged egg-shell” from tight however, cellular lithospheric dishes you to definitely overlie the new ductile asthenosphere. Information about the nature of the water flooring – hence reside over sixty per cent away from Planet’s body – is the top contributor on the principle. Dishes enjoys around three types of borders: divergent plate, alter blame and you may convergent dish.

Divergent Plate Borders

Spreading ridges, or divergent plate boundaries, is places where plates circulate apart and you can grow because of the inclusion out-of basalt throughout the mantle. Inside the 1960, Western Harry H. Hess elaborated on Holmes’ thought of mantle convection tissues. Read more