What is meant by A map scale with the representative of fraction 1/100,000

That means that a map represetings 100,000th of he actaul thing that it is maping. For example in a map 1 inch or 1 unit would represent 250 miles. Essentailly it is a unit rate that can be thought of like a raito or fraction represetning the actaul distance since a map cant be 250 miles per square on it, 1:100,000

Explanation:

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.