Tantalum from African coltan is used primarily for the manufacture of ________
A) plastics
B) electronics such as cell phones, computers, digital cameras
C) pesticides, fertilizers, and biodiesel fuel
D) aerospace engines and aircraft hulls
E) high-quality steel
B
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Thermals and advection are both types of:
A) convection. B) conduction C) radiation. D) transmission.
List five effects that are occurring or predicted to occur as a consequence of global warming
Accessory minerals ____
A)are present in large quantities in rocks B)are easily leached from the mineral crystal structure C)always fracture rather than cleave D)make up the structure of clam shells E)are not useful for identification and classification of rocks
Since the 1980s, the United States has
A) increased its oil discoveries and production and today imports about 50% of its oil. B) seen its oil production keep pace with consumption. C) been steadily consuming more oil and producing less. D) improved the efficiency of its technology and now imports no foreign oil.