Most of the coal mining in the United States is done by

a. open-pit mining
b. underground mining
c. both


Answer is a. open-pit mining (Based on 2015 data there were 1,460 coal mines, 405 underground, 1,055 surface/open-pit in US)

Environmental & Atmospheric Sciences

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What is the highest elevation shown in this part of the Panamint Range?

The question is based on Map T-10, the “Furnace Creek, California” quadrangle (scale 1:62,500; contour interval 80 feet; dotted lines represent 20-foot contours). This portion of the Furnace Creek quadrangle shows the Panamint Range and the western side of Death Valley in Death Valley National Park (36°19'08"N, 116°53'25"W). Several large alluvial fans can be seen along the eastern front of the Panamint Range. The basin floor here is called the Death Valley “salt pan,” because salts have accumulated here in great thicknesses. What will be an ideal response?

Environmental & Atmospheric Sciences

The world's largest Islamic state is

A. Algeria B. Indonesia C. Iraq D. Iran

Environmental & Atmospheric Sciences

The largest consumer of water in the United States is

A. hydroelectric power generation. B. municipal water supply systems. C. thermoelectric power generation. D. agricultural activities.

Environmental & Atmospheric Sciences

The boundary between two terranes or two continents that have collided is called a ________

A) stitch B) join C) suture D) weld

Environmental & Atmospheric Sciences