Where the Earth Meets

Where the Earth Meets, originally uploaded by M. Rosenberg.

This literally is "where the Earth meets." It was taken in Thingvellir National Park, which is in Iceland. The rifts between the rocks are actually a result of movement of the Eurasian and North American plate boundaries that run through Iceland. In the south, the plates inch past each other, but at Thingvellir, they break apart and the land between subsides. Away from the plate boundaries the activity is fairly constant, about two centimetres a year, but in the rift zones themselves, tensional stress accumulates during a long period and is then released in a burst of activity when fracture boundaries are reached.