The youngest rocks found on the moon by Apollo missions are older than all but a few rocks on Earth
Indicate whether the statement is true or false
TRUE
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The minimum concentration factor necessary for profitable mining of an ore deposit depends on each of the following except
A. the metal's average concentration in a deposit. B. the mineral in which the metal of interest occurs. C. how the metal will be used once it is extracted from ore. D. the price of the metal being recovered.
Microwaves have the shortest wavelengths in the electromagnetic spectrum
Indicate whether the statement is true or false
The recurrence interval of a flood is the:
a. statistical average amount of time between floods of a given magnitude b. the time between two floods of a particular magnitude c. the probability that a flood of a certain magnitude will occur in a particular year d. the number of years of record that are necessary to calculate the 100-year flood for a stream
When the dollar appreciates in foreign-exchange markets relative to other currencies, it can
A) buy more goods and services from other countries. B) buy fewer goods and services from other countries. C) buy a steady amount of goods and services from other countries. D) buy more goods but fewer services from other countries. E) buy fewer goods but more services from other countries.