List the four agents of metamorphism and describe the role of each
What will be an ideal response?
a. Heat is the most important agent of metamorphism. It causes recrystallization of minerals into new minerals that are stable under the conditions of metamorphism.
b. Confining pressure squeezes the rock, compacts it, makes it denser, and can cause recrystallization as well. Confining pressure applies forces equally in all directions.
c. Differential stress applies unequal forces in different directions, resulting in the elongation (lengthening) of rocks. Deformation caused by differential stress plays a major role in developing metamorphic texture.
d. Chemically active fluids can act as catalysts for recrystallization. The hotter the fluids, the more they influence recrystallization. The ions they contain can also result in changing the chemical composition of the rock during recrystallization.
You might also like to view...
Hunters and gathers did leave their mark on the natural environment as stated by the Pleistocene overkill hypothesis
Indicate whether the statement is true or false
A prism- or wedge-shaped, structurally complex zone of faults, folds, and mostly metamorphosed rocks that forms along the upper parts of a subduction zone where sedimentary material and oceanic crust are scraped off the downgoing slab is called a(n)
A. accretionary prism. B. passive margin. C. foreland basin. D. subduction wedge.
Air and water pollution are directly responsible for the loss of some species. In their studies of these pollution effects, biologists have determined that ________ are especially sensitive to air pollution, and are now being used as an index of urban
air quality. A) songbirds B) lichens C) deciduous trees D) warblers E) evergreen trees
Exponential growth in a population
A. refers to an increase by a constant percentage each year. B. includes any pattern of increase in numbers. C. is also called arithmetic growth. D. refers to an increase by a constant amount, such as a net gain of 100 individuals per year.