This is a rock that has been broken due to a process called Frost Shattering. Frost shattering occurs in the joints and cracks of rocks, because during the day the temperature fluctuates and at night the water inside the cracks freezing creating expansion. When the frozen water (called ICE) melts, the crack of the rock has now become too big to hold on, and the small fragment which was held together by a string (smaller side of the crack) falls off, making it appear that the rock has been spilt in two. Woooohooooo.
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