For a wind farm to be effective, there needs to be

a. many turbines

b. wind in only one direction

c. low average wind speeds

d. one turbine

The correct answer for the blank is-

A. many turbines .

In a wind farm, wind energy is harnessed in the form of mechanical energy, which is used to produce electricity when turbines rotate ( due to propeller like blades present around a rotor) due to higher speed of wind. The rotor is linked to the main body that rotates, ultimately leading to generation of electricity.

This means that larger the number of turbines, larger is the amount of energy harnessed.

Thus, for a wind farm to be effective, there needs to be many turbines.

false because ozone (o3) depletion does not cause global warming, but both of these environmental problems have a common cause: human activities that release pollutants into the atmosphere altering it.

global warming is caused primarily by putting too much carbon dioxide into the atmosphere when coal, oil, and natural gas are burned to generate electricity or to run our cars.

explanation:

true is the final answer!