Which of the following is not a disadvantage of using wind power? A.
Turbines are expensive.
B.
Birds often fly into fan blades.
C.
Energy production decreases at night.
D.
Turbines are only effective in specific areas.

Please select the best answer from the choices provided
A
B
C
D

Drastic boundary changes can occur for all of the following reasons except for a. a shift in the way a river flows b. the collapse of a government system c. a conflict between two neighboring groups d. one country's decision to sell land to another country select the best answer from the choices provide

The primary agent of contact metamorphism is

The earth rotates on its axis and revolves around the sun every