Mound-like structures that represent the remains of photosynthesizing cyanobacteria are ____
a. greenstone belts
b. stromatolites
c. back-arc basins
d. cratons
e. black smokers
b
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Which of the following is true concerning the Saffir-Simpson scale except
A) category 3–5 storms are considered major hurricanes. B) Hurricane Katrina was a category 5 hurricane. C) a tropical storm becomes a hurricane when winds exceed 119 km/hr (74 mi/hr). D) a category 5 hurricane produces more than five times the damage of a category 1 hurricane.
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.
The periods of the Late Paleozoic include all of the following except
a. Silurian. d. Permian. b. Mississippian. e. Pennsylvanian. c. Devonian.
A long lightning flash at some distance from the observer produces the thunder we hear as a rumble
Indicate whether the statement is true or false