Which resource, found in africa is used in many technology devices?

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

On nights when we see the new moon phase, what side of the moon are we seeing?

What is the approximate chemical composition of the solar nebula?