Since volcanic eruptions occur frequently and bring new minerals to the surface, minerals are considered to be renewable resources.
Answer the following statement true (T) or false (F)
False
While it is true that volcanic eruptions occur frequently, this type of geologic activity does not concentrate desirable minerals into a form that we can economically exploit. The geologic processes that concentrate minerals operate on a very slow time scale, typically millions of years.
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Affluent nations tend to be totally reliant on domestic mineral sources
Indicate whether the statement is true or false
Which of the following rocks has a high modulus ratio?
a. marble b. quartzite c. slate d. gneiss
Why is 70% ethanol rather than 95% ethanol used in sterilizing skin before injections?
A) 70% ethanol kills bacteria by denaturing their surface proteins. B) 70% ethanol kills bacteria by penetrating them and coagulating their proteins. C) Special precautions must be taken when using 95% ethanol. D) None of the above is correct.
Who was the Aztec leader who welcomed Hernando Cortes due to the belief that his arrival fulfilled the prophecy that the god Quetzalcoatl would someday return?
a. Veracruz b. Atahualpa c. Tenochtitlan d. Chibcha e. Moctezuma