With a history that stretches back 3 and half billion years, the enormous formations that make up the Balancing Rocks are the one among the oldest wonders on the planet. The rocks appear to be so precariously balanced, one on top of another, that even a light push could send them rolling down into the surrounding scrub. But as the thoushands of tourists who have tried can testify, no shove can dislodge the Balancing Rocks. They sway, but they never fall.
How do these rocks balance? Time, Climate, erosion and the structure of the rock give the answers. The rocks were once part of the earth's crust. The crust is mainly granite, which originally lay molten deep within the earth. Over millennia it gradually rose toward the surface, cooled, shrank, and cracked in such a way as to produce a series of massive granite blocks that were more or less rectangular. As time passed, groundwater seeping in through the cracks weathered these blocks and eventually rounded off the once angular corners. After the rocks became exposed on the surface of the land, the sun, wind and rain completed the rounding-off process. Daily heating and cooling helped flake off the surface layers already loosened by water, wind and rain carried away the debris. Thus, once-solid mass of granite has eroded into a heap of giant boulders, some poised at such delicate angles that a hand can rock but never dislodge them.
How do these rocks balance? Time, Climate, erosion and the structure of the rock give the answers. The rocks were once part of the earth's crust. The crust is mainly granite, which originally lay molten deep within the earth. Over millennia it gradually rose toward the surface, cooled, shrank, and cracked in such a way as to produce a series of massive granite blocks that were more or less rectangular. As time passed, groundwater seeping in through the cracks weathered these blocks and eventually rounded off the once angular corners. After the rocks became exposed on the surface of the land, the sun, wind and rain completed the rounding-off process. Daily heating and cooling helped flake off the surface layers already loosened by water, wind and rain carried away the debris. Thus, once-solid mass of granite has eroded into a heap of giant boulders, some poised at such delicate angles that a hand can rock but never dislodge them.
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