Which of the following is an example of region?
a.
fewer sheep graze in ireland today than in the past.
b.
memphis is in southwestern tennessee.
c.
brazil is part of latin america.
d.
the population of denmark is 5.25 million people.

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.

a. themes: sub fields