How are the conditions of metamorphism determined? Why aren't minerals such as quartz and feldspar helpful in determining the conditions?
What will be an ideal response?
Answer: Index minerals reveal metamorphic temperature and pressure because they are stable over limited ranges of temperature, pressure, or both. Other minerals, such as quartz and feldspar, do not indicate metamorphic grade because they are stable over large temperature and pressure ranges.
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A ____________________ shows the percentages of the members of a population surviving at different ages.
Fill in the blank(s) with the appropriate word(s).
Scientific evidence suggests that Earth formed approximately ____________ ago
a. 4.6 trillion years d. 4600 years b. 4.6 million years e. 460 years c. 4.6 billion years
Topsoil plays an important role in the ecosystem service of ____.
A. biodiversity B. ecosystems C. natural resources D. win-win solutions E. nutrient cycling
Which climate is characterized by the largest change in monthly average temperatures; i.e., the greatest change in temperatures from one month to the next?
A) boreal forest B) tundra C) ice cap D) dry-midlatitude