With half of west africa's population, which country experienced so much bad government that it went from an oil-rich, middle-income country to one of the world's poorest? a. ghana b. niger c. senegal d. nigeria

Ateam of researchers calculates that a glacier will melt completely away in the next 100 years. which land structure will most likely be left behind after the glacier melts?

¿cual es mas alta en baja california,la migracion o la inmigracion?

Which of these is a drawback of using natural gas? a. it is fairly safe for use in homes.b. it burns more cleanly than crude oil products.c. scientists have developed new ways of extracting it.d. during its extraction, groundwater can be contaminated.