Author : Researcher of Geodynamics, email In the last article of myths of mantle convection, we were put into a confusion that what the state of mantle is. Convection in a medium implied the medium should be fluid, on the other hand propagation of S-wave indicates that the material must be solid. How can a same material possess two states simultaneously? Let us discuss over this matter.
If we observe racks of books shelves for a longer time, will see that the straight racks, made up of wood or metal, get little bit bent. This means that their initial length has increased due to some flow inside the material (this is not elasticity, as the bent woods never get back to original shape). However, their end points remained same. Important to mention, that such bending occurs in a time scale of several years (5-10 years, depending on wight of books and material of shelf).
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