A mineral deposit can be classified as an ore deposit when
A) valuable metals are present in the deposit.
B) valuable metals in the deposit can be mined at a profit.
C) it contains valuable fossil fuels.
D) it contains valuable gemstone quality minerals.
B
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Who reputedly coined the term "geography"?
A. Ptolemy B. Hipparchus C. Eratosthenes D. Strabo
Landslides and ground motion are significant sources of danger created by earthquakes. Indicate whether the statement is true or false
Until regulation of air pollution began in the 1950s, the greatest influence on emissions of air pollutants was/were:
A) lack of education about pollution's ill effects. B) macroscale atmospheric changes. C) both economic conditions and population growth. D) poor technology.
The relative humidity would be ________% if the actual water vapor in the air were 10 grams per cubic meter, the air's capacity to hold water vapor were 20 grams per cubic meter, and the dew-point temperature was 20 degrees Celsius
A) 10 B) 20 C) 50 D) 2 E) 200