Mercury-197 is a g emitter. What isotope is formed when 197Hg emits g radiation?
A) 197Au
B) 197Hg
C) 197Tl
D) 197Pb
B
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Sand-size grains of feldspar can be preserved in a soil profile over great time periods because of feldspar's resistance to chemical weathering.
Answer the following statement true (T) or false (F)
What direction has the Pacific plate been moving for the last 40 million years?
A) Southeast B) North C) Northwest D) Northeast E) West
The trickling-filter system and the activated-sludge systems in wastewater treatment both require
a. the addition of large amounts of chlorine to kill pathogens. b. the addition of large amounts of ammonia as nutrients to support decomposers. c. high levels of oxygen to promote aerobic decomposition. d. high levels of carbon dioxide to adjust the pH of the water for bacterial action.
__________ are the main attraction of the region driving the economic forces that determine the development patterns of individual countries.
a. Mountain ranges b. Natural resources c. Expansive steppes d. Agricultural products e. Tourist destinations