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Geography, 30.03.2021 21:10 villarrealc1987
Galena - Coeur d'Alene Mining District/Silver Valley, ID. The Coeur d'Alene Mining District in Silver Valley, ID is known for its large lead deposits of the mineral galena (PbS). Galena is one of the few common minerals with a metallic luster that has a distinctive cleavage (cleavage is how a mineral breaks or parts along preexisting planes of weakness). Cleavage is described by the number of unique directions of cleavage planes and the angle between those planes. Which of the following best describes galena's cleavage (see animation in placemark)?
a. three directions at ~90
b. three directions not at ~90°
c. two directions at ~90°
d. two directions not at ~90°
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Geography, 23.06.2019 16:00
If we review the changes in the landscape surrounding the great salt lake in utah we can see a change in topography. look at the area to the south of the lake. what change has occurred during the last twenty-nine years? a) erosion of the hills b) an increase in marshland c) flooding of the area and the development of wetlands d) deposition of sediments and an increase in elevation
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Geography, 24.06.2019 03:00
How far is a geographic second? a.) around 100 feet b.) around 1,000 feet c.) around 5,000 feet d.) none of the above
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Galena - Coeur d'Alene Mining District/Silver Valley, ID. The Coeur d'Alene Mining District in Silve...
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