What point on Earth's surface is directly above the focus? A. epicenter
B. fault
C. focus
D. Magnitude​

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

These factors threaten north americas ecosystems

In the figure, polygon abcd is transformed to create polygon a′b′c′d′. this transformation is a by a factor of .