The ancient greek geographer ptolemy created a grid system and listed the for places throughout the known world in his book geography. a. elevations/ b. altitudes / c. coordinates / d. meridians

The book "Geography" is a revision of the atlas which includes large world map but also less detailed world map with latitude and longitutde coordinates. The ancient Greek geographer Ptolemy created this grid system and listed the coordinated for places throughout the known world.