This animation illustrates how the weak, plastic flows allowing the rigid crust to "float" atop pushed apart by convection currents in the mantle.

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

Which of the following is a way that advancements in technology improve humans' ability to measure air quality and protect human health?

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