________ 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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Since its formation, the Moon has slowly been moving away from Earth
a. True b. False
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Fill in the blank(s) with the appropriate word(s).
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