Time zones are separated by approximately 15 degrees longitude. Since there are 24 hours in 1 day, there are 24 time zones on Earth. As the Earth completes one full rotation of 360 degrees in 24 hours, the distance between time zones in degrees can be found by dividing 360 degrees by 24 time zones.

360/24 = 15 degrees per time zone

The correct answer is 15 degrees longitude. The Earth rotates horizontally around its axis, so time zones would be drawn from North to South. Longitudinal lines run North to South, making lines of longitude the correct choice.

The Mercator Projection would be a very poor choice for depicting population density because the projections creates large distortions in landmasses near the poles. This issue makes the Mercator Projection inappropriate for showing land area-based data like population densities.

The Mercator Projection was created for ship navigation, so the projection would be a good choice for navigating between Europe and North America by ship. A Mercator Projection could be used to show where Africa is in relation to Europe because the land-mass distortions occur most at the poles. The Mercator Projection is able to depict lines of latitude and longitude effectively. Because the Mercator Projection has substantial distortion at the poles, it would be a good choice for showing the distortion that occurs from creating projections.

The Mercator Projection, designed by Gerardus Mercator in 1569, became the standard map projection used for nautical purposes because it correctly represents true direction everywhere on earth on a two-dimensional plane. It is a conformal map projection, which properly shows all lines of longitude and latitude on a grid plane with correct 90 degree angle crossing points throughout the map.

The Robinson Projection was created by Arthur Robinson, coming late to the map-making game in 1963. Robinson's projection is not an equal-area projection or a conformal projection, but rather is a combination of both. Robinson's projection shows the entire earth and distorts both shape and size slightly to make the two-dimensional representation look the most like the three-dimensional reality of the earth. Robinson's projection, though losing true shape, size, and direction, is the most widely used projection today.

The Conic Projection is not a specific projection, but rather is any map projection which equally spaces meridians radiating out from whatever the apex of the map is. Meanwhile, lines of latitudes (parallels) are mapped as circular arcs centered on the map's apex. Most commonly, the apex of conic map projections is the center of the north or south pole. This projection type is most often used to more accurately map the north or south pole.

The True Map Projection is not a map projection, it is a made-up term for the purposes of this quiz.

The Mollweide Projection was developed by Carl Mollweide in 1805. This map projection is a equal-area and pseudo-cylindrical representation of the earth. Instead of showing accuracy of angle in lines of latitude and longitude, or accuracy of shape, it distorts both of those factors in order to show accuracy of size in area throughout the entire world. It is only on this map projection that one can see the true size of the continents in relation to each other. On all other map projections, the continent of Africa looks much smaller than it actually is, distorting the size and often the shape as well. But with this map projection, the shape might be slightly skewed in order to gain the benefit of seeing the true large size that Africa boasts in comparison to the rest of the world.