The odorless, invisible gas that can be the most dangerous product of a volcano is ____
a. ?hydrogen sulfide
b. ?carbon dioxide
c. ?carbon sulfide
d. ?sulfur dioxide
e. ?hydrogen dioxide
ANSWER: b
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In science, especially physics, an educated guess is called a
A. fact. B. theory. C. both a fact and a theory. D. none of the above
Answer the following statement(s) true (T) or false (F)
1. A major factor in the decline of the Native American populations after the arrival of Europeans was disease. 2. The economy of the Middle Colonies was characterized by plantation agriculture. 3. The rate of population increase in the United States is similar to that of other materially wealthy countries. 4. Immigrants often have higher birth rates and younger age structures than long-established populations. 5. The primary factor in whether or not immigrants—legal and illegal—come to the United States is legislation.
When an iron ring is heated, the hole becomes
A) smaller. B) larger. C) neither smaller nor larger.
Infrared
What will be an ideal response?