The Geological Story Briefly Told An Introduction to Geology for the General Re
The Geological Story Briefly Told An Introduction to Geology for the General Re
James Dwight Dana
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Expansion and contraction from change of temperature. 2. The fusion of rocks, and their ejection through volcanic vents and fissures. 3. Solidification and crystallization of fragmental rocks, through long-continued heat, and the filling of fissures and making of veins. 1. Through Expansion and Contraction. Owing to the alternation each day of sunlight and darkness, the surfaces of exposed rocks experience an alternate heating and cooling, and therefore alternate expansion and contraction. This... cause, which is sufficient to break the solder of soldered metallic roofs on houses, to loosen the cemented blocks of a stone wall, and to give a perceptible movement to high stone towers, tends to start off the grains, and sometimes separates an outer layer from bare rocks, especially when the surface is weathered. As it is in action over the whole surface of the earth, it is an important addition, in a quiet way, to the chemical work of air and moisture, in the making of earth or gravel for the formation of rock deposits; and it has been so ever since the sun first shone upon bare rocks.
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