Figure 2. Cartoon depicting the diurnal solar heating of a rock imbedded in a soil. View to the north. Colors depict soil and rock surface temperatures in the morning and afternoon (warm colors = hot temperatures and cool colors = cool temperatures). It can be hypothesized that cracks might form perpendicular (i.e. north-south) to stresses that arise as a function of these changing temperature gradients throughout the day or during periods of cloud cover.
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Sep16 11
