A silica tetrahedron is composed of:
a. one silicon atom and three oxygen atoms
b. one silicon atom and four oxygen atoms
c. one silicon atom and three hydroxide molecules
d. one silicon atom; three oxygen atoms; and one or more cations, depending on their charge
b
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Howler monkeys are examples of New World monkeys. Indicate whether the statement is true or false
Ash flows are rarely dangerous
Indicate whether the statement is true or false
Yugoslavia and its former republics have been a major area of tension and warfare in the 1990s
First discuss the historical, ethnic, linguistic, and religious background of Yugoslavia, and then examine the conflicts of the 1990s, including the reasons for their occurrence and what has been done to settle them.
Which of the following is NOT true of a volcanic dome?
A. Many domes are associated with composite volcanoes and calderas. B. They are one of the largest types of volcanoes. C. Some parts contain volcanic glass, such as obsidian. D. The outer part of the dome contains blocks and other rubble.