Glass Mountain began with an explosive eruption of ash that blanketed the surrounding forest, killing all the trees.
Earth cycles Global cycles of life-giving elements
This pumice has the same composition as the obsidian next to it.
Earth cycles Global cycles of life-giving elements
This model represent a segment of a core known as GISP2.
Earth cycles Global cycles of life-giving elements
Geologists conduct experiments on rocks to discover how they respond to heat and pressure.
Earth cycles Global cycles of life-giving elements
Magma is molten rock.
Earth cycles Global cycles of life-giving elements
The upper walls of the Grand Canyon reveal sedimentary rock layers formed in marine and continental environments between 550 and 260 million years ago.
Earth cycles Global cycles of life-giving elements
On March 27, 1964, one of the largest earthquakes of the 20th century occurred in southern Alaska.
Earth cycles Global cycles of life-giving elements
A fault is a rock fracture along which movement occurs.
Earth cycles Global cycles of life-giving elements
The Anatolian transform fault system is probably the most active in the world.
Earth cycles Global cycles of life-giving elements
The sediments that formed both of the Old Red Sandstones were laid down in the same basin during the Devonian Period.
Earth cycles Global cycles of life-giving elements
