Why Isn't Manganese Mined on the Seabed When There Are

question 32

Multiple Choice

Why isn't manganese mined on the seabed when there are abundant manganese nodules in some parts of the ocean floor?

• A)The manganese is too difficult to extract from the nodules; a new technology is needed.
• B)It is not economical to mine manganese nodules at present-day world prices for manganese and associated metals in nodules.
• C)The manganese market is held by a global cartel who prevent the material from being mined.
• D)It is impossible to extract the nodules from the seafloor with present-day technology.

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Definitions:

Z-statistic

A specific kind of norm score that shows the number of standard deviations by which an individual item deviates from the distribution's average.

Critical Value

The threshold in a statistical test that defines the boundary for rejecting the null hypothesis.

Calculated Value

A numerical value derived from a mathematical computation or formula.

Directional

Refers to a hypothesis or test that specifies the expected direction of the relationship or difference between variables.