• A map is a reduced, simplified image of a territory.
• A map should always include a scale, so that the distances between different places can be calculated.
• Different map projections strive to present Earth on a two-dimensional plain as accurately as possible.
• The equator divides planet Earth into Northern (N) and Southern (S) Hemispheres.
• The zero meridian at Greenwich divides planet Earth into Eastern (E) and Western (W) Hemispheres.
• Latitudes run over Earth horizontally, and their degrees can range from 0 (the equator) to 90 (the North and South Poles).
• Longitudes run over Earth vertically, and their degrees can range from 0 (Greenwich) to 180 (the Pacific date line).
• Together atitudes and longitudes create a coordinate grid, which makes it possible to present a location on the planet by using coordinates.