What are the human impacts on the Earth System?
a. The modification of landscapes and ecosystems
b. Pollution
c. Recent global warming
d. All of the above
e. Both a and b
Ans: d. All of the above
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Why does air flow into the center of a cyclone?
A. The center of a cyclone is near Earth's surface. B. The center of a cyclone is a region of low air pressure. C. The center of a cyclone is a region of cold air. D. The center of a cyclone is a region of high air pressure.
The second step in the development of a hurricane is the
A) easterly wave. B) tropical depression. C) tropical storm. D) tropical disturbance.
Which of the following chemical bonds is formed by atoms that have a strong tendency to give up or attract neutrons?
a. metallic b. covalent c. crystalline d. ionic
Deficiency of which of the following is associated with anemia?
A) folic acid B) nicotinic acid C) riboflavin D) thiamine