What triggers the small earthquakes that occur around a volcano before an eruption? a. upward movement of magma b. pyroclastic flow c. cooling magma inside the crust d. plate movements

What two advantages do the coastal countries of west africa have over the sahel countriesfertile soil and mineral resources temperatures and terrain human resources and natural resources weather patterns and location

What are economic benefits of building dams

Dry land planting can benefit the environment by reducing the need for tillagate