20. The purpose of a grid system on a map is to: a. Represent elevation changes b. Provide coordinates for location c. Indicate land use d. Show political boundaries

A grid system on a map primarily serves to provide a standardized method for identifying coordinates, enabling users to pinpoint exact locations easily. Think of it as a giant game of Battleship, where you can quickly find your spot on the map using a combination of letters and numbers! Using grid references is not just for map enthusiasts; it's a practical tool in everyday life too! Whether you're finding your way in a national park or navigating a bustling city, being able to read grid coordinates helps you get where you need to go without turning into a lost wanderer. Plus, it's a great way to impress friends with your map-savvy skills!