Why do you think that opec nations will start changing to renewable energy sources? do you mean when petroleum gets to a very limited amount? i was thinking that opec nations would hold onto their oil reserves and forego adopting new technologies. if they do begin to adopt renewable energy sources you think their relationships will improve with other nations?

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.