Discuss the crystalline structure of minerals
A crystalline substance has a definite internal structure such that the atoms are in
specific proportions and are arranged in an orderly geometric pattern. Under ideal
conditions of crystal growth, perfect crystal faces will form. Although the size of a
crystal may vary, the angle between faces of a specific mineral will be the same.
Substances that when crystallizing become solid without a definite internal structure
are called amorphous.
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Compared to Jupiter, Saturn's atmosphere is:
A) more calm with fewer disturbances or storms. B) more uniform with no significant variation in color in the lower cloud levels. C) more violent with larger storm phenomena easily viewed from Earth. D) much thicker causing the visibility of the lower layers to be reduced. E) more colorful with variations in color easily viewed from Earth.
How did Harlow Shapley determine where the center of the galaxy lies?
a. He plotted the distribution of open clusters. b. He plotted the distribution of globular clusters. c. He made star counts in every direction of the galactic disk. d. He measured the amount of dust obscuration in every direction of the galactic disk.
The Mississippi River delta has widely spaced distributary channels extending long distances into the Gulf of Mexico. This is an example of a(n) ________ delta.
a. estuarine b. bird's-foot c. alluvial d. fluvial e. arcuate
In a typical transmission line, the current I is very small and the voltage V is very large. A unit length of line has resistance R. For a power line that supplies power to 10,000 households, we can conclude that
A. IV = I 2R. B. I = V/R. C. IVI 2R. E. I 2R = 0.