What marine resource has been rendered uneconomical due to the cost of excavation?
a. Magnesium compounds
b. Manganese nodules
c. Sand and gravel
d. Salt
ANS: B
There are different ways of mining manganese nodules. Unfortunately, none of the methods people
have come up with have made it cost effective to mine these nodules. There may come a point in time
when the mining of these nodules becomes economical. Information can be found in the section
Physical Resources.
You might also like to view...
What happens to the abundance of the parent isotope over time?
A. It stays the same. B. It decreases. C. It increases.
Though Hong Kong is now part of China, its northern border is separated from the rest of the country by an electrified fence to control the movement of goods and people
Indicate whether this statement is true or false
Other than the west coast and western interior, an earthquake hazard map of the continental United States shows ________ to have the highest probability of strong ground shaking over a 50-year period
A) Florida B) southern Texas C) northern Minnesota D) North Dakota E) the central Mississippi River Valley area
A world map drawn so that the size of each country is the reflection of its population rather than its size is called
A) a Mercator projection. B) a standard land-area map. C) a conic projection. D) a cartogram.