Hypotheses of origin generally fall into two categories : one, the dichotomy was produced by a mega-impact event or several large impacts early in the planet s history ( exogenic theories ) or two, the dichotomy was produced by crustal thinning in the northern hemisphere by mantle convection, overturning, or other chemical and thermal processes in the planet s interior ( endogenic theories ).
22.
However, in " D'o?viens-tu, Scrameustache ", p . 12, it seems that " Scrameustache " is a backronym for " Sujet Cr�� par Radiations Artificielles et Manipulations Extra-Ut�rines Sans Toucher Aux Chromosomes H�r�ditaires Endog�nes " ( " Subject created by artificial radiations and extra-uterine manipulations without touching to hereditary endogenic chromosomes " ).
23.
Hamilton emphasized that the direct correlation of gravity fields with topography require most Martian and Venusian topography to be supported by cold, strong upper mantles, and is incompatible with the popularly assumed hot, active mantles . ( The very different correlation on Earth shows that topography of similar dimensions here floats isostatically on truly hot, weak mantle . ) Purported Venusian and Martian volcanoes, including Olympus Mons, do not resemble Earth s endogenic volcanoes, and instead are roughly circular, and commonly gentle-sided, products of vast masses of spreading melts from single events.
24.
After analyzing the presence / absence of several geologic features associated with impact craters, such as target rocks, breccias, pseudo-shatter cones, and circular morphology, the authors concluded : " [ T ] here are [ sic ] no clear and unequivocal evidence supporting the impact origin of the circular structures in Glif Kebir region; until substantial evidence is produced, it's necessary to identify the origin of the craters in others [ sic ] endogenic geological processes . " They proposed the most likely alternative source of the crater to be a hydrothermal vent, although they went on to say : " However, even this hypothesis is not fully satisfactory : probably these complex and peculiar features are the result of interaction between different geological process.
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