What factors contributed to the current boom in gold mining in the U.S.? What will be an ideal response?
The price of gold went up, and new technology made it possible to extract gold more economically
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Early geologists tried calculating the age of Earth based on sedimentation rates and deduced ages of 1 million to 2
billion years old. Explain the logic behind using sedimentation rates to calculate the age of Earth, and explain at least two reasons why this method did not work. What will be an ideal response?
The future use of electricity to power personal transportation largely depends on
A) more-efficient turbogenerators. B) finding more fossil fuel supplies. C) low-cost, lightweight batteries that can store large amounts of power. D) the development of small turbogenerators for automobiles.
Many of the sites that are sacred for India's Hindus are located
A) near rivers. B) in the southern part of the country. C) on the border with Bangladesh. D) near the centers of major cities. E) in the highlands of Tibet.
Obsidian is a felsic rock, yet has a black color. Explain
What will be an ideal response?