A small cavern begins to form at the base of the Falls, and the overlying rock loses its support and collapses.
22.
As material continues to rise, it forms a large pool of melted basalt under the crust and slowly melts the overlying rock.
23.
Collision of this Archean intruded into the overlying rocks 1830 million years ago,; these plutons mark the end of the Penokean orogeny.
24.
As the overlying rock was worn away, pressure was relieved and horizontal cracks developed, allowing water to get into the rock layers.
25.
By pushing upward and piercing overlying rock layers, diapirs can form anticlines, salt domes and other structures capable of trapping petroleum and natural gas.
26.
Towards the end of this period granite was formed beneath the overlying rocks of Devon and Cornwall, now exposed at Dartmoor and Bodmin Moor.
27.
This is referred to as hypogenic karstification . From time to time, overlying rock collapsed into hollow chambers below, creating deep shafts.
28.
With the loss of the confining pressure of the overlying rock, Mount St . Helens began to rapidly emit steam and other volcanic gases.
29.
The kinds and amounts of overlying rock indicate that the crater, about 12 miles in diameter, was formed 60 million to 65 million years ago.
30.
One theory was the upheaval is a salt dome, an anticlinal structure which occurs when a salt diapir is pushed up by the weight of overlying rocks.
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