They occur when magma (molten rock material) congeals so rapidly that crystallization remains incomplete.
Molten rock material from Earth's mantle rises upward to the crests, cools, and is later pushed aside by new intrusions.
Folds and small faults may form at the foot of the slope where the rock material is under stress.
The main rock material of Puglia is limestone, except on the coastline, which is mostly low and sandy.
Mr. Hiatt describes the new record as a departure from his more intense rock material of the past.
Good omens for a CD of all-new rock material he is working on now, for the Sony label.
Resulting rock material is embedded in the glacier and scours a concave floor, which may contain a small lake (tarn) if the glacier disappears.
In general, most soils are formed in place from parent rock material that has been subjected to prolonged erosion and consequently has limited fertility.
The topmost layer, about 500 metres (1,650 feet) thick, includes lavas made of basalt (that is, rock material consisting largely of plagioclase [feldspar] and pyroxene).
The Bengal Cone continues to form from rock material eroded from the Himalayas and transported by the Ganges and Brahmaputra rivers.
A small-scale form of exfoliation, called spheroidal weathering, is restricted to boulder-sized rock material and may occur at some depth within the Earth.
