Which sub-saharan climate region contains the cities with the largest population densities?
a) sahel
b) mediterranean
c) tropical savanna
d) tropical rainforest
you!

a mid-ocean ridge or mid-oceanic ridge is an underwater mountain range, formed by plate tectonics. this uplifting of the ocean floor occurs when convection currents rise in the mantle beneath the oceanic crust and create magma where two tectonic plates meet at a divergent boundary.a geomagnetic reversal is a change in a planet's magnetic field such that the positions of magnetic north and magnetic south are interchanged.

b.

developed countries have tended to improve the environment, while developing countries have tended to damage it.