________ are important economic resources for lead, zinc, gold, silver, tungsten, tin, and mercury.
A. Meteor impact sites
B. Marble
C. Quartzites
D. Schists
E. Hydrothermal veins
Answer: E
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Which of the following would have the highest boiling point?
A. F2 B. I2 C. Cl2 D. Br2 E. not enough information given
Since its formation, the Moon has slowly been moving away from Earth
a. True b. False
Which of the following best matches the description?Pesticide that remains active for a long period of time.
A. weed B. chlorinated hydrocarbon C. hard pesticide D. auxin E. organophosphate F. persistent pesticide G. pheromone H. biomagnification I. rodenticide J. micronutrient K. macronutrient L. macronutrients M. soft pesticide N. biocide O. micronutrients P. fungicide Q. herbicide
When the total fertility rate (TFR) is ______, a population is said to be at the replacement level.
Fill in the blank(s) with the appropriate word(s).