Podcast
Questions and Answers
What is the main reason why gold extraction from ocean water is impractical?
What is the main reason why gold extraction from ocean water is impractical?
- The concentration of gold in ocean water is extremely small.
- There are legal restrictions on extracting gold from ocean water.
- The technology for extracting gold from seawater is not advanced.
- The cost of extracting gold from seawater is high. (correct)
In terms of gold content, where is the largest known reserve found?
In terms of gold content, where is the largest known reserve found?
- In rivers and lakes
- In iron-manganese nodules on the ocean floor (correct)
- In deep-sea vents
- In continental ore deposits
Why is mining iron-manganese nodules from the deep ocean floor challenging?
Why is mining iron-manganese nodules from the deep ocean floor challenging?
- Iron-manganese nodules are radioactive.
- Sediment stirred up during mining can harm the ocean environment. (correct)
- The techniques for extraction are not developed yet.
- The nodules are too small to extract efficiently.
What is a major obstacle to extracting minerals from the open oceans?
What is a major obstacle to extracting minerals from the open oceans?
Which ocean contains many areas covered with iron-manganese nodules?
Which ocean contains many areas covered with iron-manganese nodules?
What is the term used to describe areas in the United States with a complex pattern of rock types?
What is the term used to describe areas in the United States with a complex pattern of rock types?
What is the primary reason why most rocks do not contain economically valuable minerals?
What is the primary reason why most rocks do not contain economically valuable minerals?
Why do large areas with only one or a few colors on the geologic map of the United States represent sedimentary rocks?
Why do large areas with only one or a few colors on the geologic map of the United States represent sedimentary rocks?
What geological term refers to the word 'mountain-building'?
What geological term refers to the word 'mountain-building'?
Why do metal mining operations take up much less than 0.1 percent of the total land area in the United States?
Why do metal mining operations take up much less than 0.1 percent of the total land area in the United States?
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