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For example, following questions were pointed out.
・ Why is the earth's crust under a continent thicker than that under the sea bottom ?
・ Why is no granites contained in the earth's crust under the ocean ?
・ What paths and processes were radioactive elements concentrated on granites conveyed from the inside the earth to the earth's crust through ?
・ Why are lands concentrated on the northern hemi-sphere in comparison with the southern one ?
・ Why are volcanos under the ocean more than volcanos on the land ?
・ The upper part of continental crust is mainly composed of granites, meanwhile its lower part is composed of basalts. Why ?
・ Theoretically, large quantities of rain-waters running through rivers sweep away the earths & sands on all lands to the ocean in ten million years, although continents are still left. Why ?
・ Though there are volcanos on the Antarctic continent, earthquakes scarcely happen on the continent. Why ?
・ Why are there strata containing hundreds billions tons of mineral resource such as manganese, iron, nickel, cobalt, etc in the sea bottom ?
・ Though the solubility of potassium chloride is higher than that of sodium chloride, the quantity of potassium chloride contained in a seawater is actually 1/50 of sodium chloride. Why ?
・ It's supposed that the inside of the earth is mainly heated by radioactive elements.
By the way, most of such elements are contained in the upper part of the crust of land or the surfacial layers of granites composing a mountain chain of about several kilometers in height. Why ?
・ What chemical reaction triggers a momentary great explosion of volcano ? Besides, why can such eruptions be successively caused ?
It's impossible to answer above questions with the theory of plate tectonics.
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