The of niger were caravan traders before turning to agriculture

Which is a possible result of higher air temperatures caused by global warming? a. increase in sea level b. freezing of polar ice caps c. rapid evaporation of water in the soil d. flooding of low-lying coastal areas

The earth is composed of three different chemical layers: core, mantle and crust. the formation of these layers was from a process called

Where the main factor that enabled the growth of cities and civilizations was the existence of