In 1 or 2 sentences, define nationalism and give an example.

According to Merriam Webster Dictionary, Nationalism is "loyalty and devotion to a nation; especially : a sense of national consciousness,  exalting one nation above all others and placing primary emphasis on promotion of its culture and interests as opposed to those of other nations." Nationalism is a feeling that people have of being loyal to and proud of their country, believing that their country is better and more important than other countries.

Explanation:

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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.