An increase in the environmental lapse rate of an air layer results in the layer becoming:
A) heavier. B) less stable. C) an air parcel. D) cooler. E) more stable.
B
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Why can igneous rocks be distinguished from chemical sedimentary rocks based on composition?
A) The composition of each rock results in different texture. B) The composition of each rock results in different colors. C) Igneous rocks, since formed underground, are made up of the same elements as chemical sedimentary rocks. D) Igneous rocks are primarily made up of silicates, which chemical sedimentary rocks don't contain.
What role do biologically produced sulfur gases play in glacial climate fluctuations?
What will be an ideal response?
Why is talc a slippery mineral whereas quartz is a hard mineral?
a. Quartz is composed of sheet structures, whereas talc is composed of single chain structures. b. Quartz has sheet structures that are held together very strongly by magnesium ions, whereas talc lacks such strong bonds between its sheet structures. c. Quartz only has silicon-oxygen bonds, which are equally strong in all directions, whereas talc is made of sheet structures. d. Quartz is composed of single chain structures, whereas talc is composed of sheet structures. e. Talc only has silicon-oxygen bonds, which are equally strong in all directions, whereas quartz is made of sheet structures.
Please compare and contrast muscovite and biotite.
a. Both muscovite and biotite are feldspars that have cleavage in two directions and have a shiny luster. However, unlike clear muscovite, biotite is black because it contains iron and magnesium. b. Both muscovite and biotite are micas that have cleavage in two directions and have a shiny luster. However, unlike clear muscovite, biotite is black because it contains iron and magnesium. c. Both muscovite and biotite are micas that have cleavage in one direction and have a shiny luster. However, unlike clear muscovite, biotite is black because it contains iron and magnesium. d. Both muscovite and biotite are micas that have cleavage in one direction and have a shiny luster. However, unlike clear biotite, muscovite is black because it contains iron and magnesium. e. Both muscovite and biotite are feldspars that have cleavage in one direction and have a shiny luster. However, unlike clear muscovite, biotite is black because it contains iron and magnesium.