Chapter 21: Energy and Mineral Resources

Concept #6 Quiz

Choose the best possible answer to the following questions about Key Concept 6 "Mineral resources: Weathering and ore deposits."



1. How does chemical weathering concentrate metals into ores? [Hint]

2. Aluminum is the third most common element in Earth’s crust. So why are ores of aluminum (bauxite) NOT so common?  


The specimen of bauxite in the photograph is an ore of aluminum. Indicate which parts are "useful" and which parts are not, and are discarded in the processing of this ore:  

For each item below, use the pull-down menu to select the letter that labels the correct part of the image.

The letters A through B appear on an image associated with this question.


Match the ore or deposit with the appropriate process by which it formed.  

Using the pulldown boxes, match each item on the left to the corresponding item at right.

A. leaching from aluminum-rich source rock under tropical conditions
B. gravity sorting of heavy minerals in streams
C. leached from a pyrite ore

5. Which of the following is NOT a common site for a placer deposit? [Hint]

Answer choices in this exercise are randomized and will appear in a different order each time the page is loaded.

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