Ключевые слова: basalt, canyon, crack, crest, crevice, fault, fissure, geology, iceland, ingvellir, landscape, lava, lava flow, lava run, magma, mid atlantic ridge, national park, nature, plate, ridge, rift, rift valley, rock, stream, tectonic, tectonic plate, thingvellir, track, valley, volcanic, volcanic rock, volcano,