Written around AD 150 by Claudius Ptolemy, the Geography is an atlas, a gazetteer and treatise on cartography, organizing the cartographic principles of the 2nd-century Roman Empire. Columbus used this work as a world map. However, during the course of time, he revised this geography farther by using 53⅔ Italian naval miles as the measure of a standard rather the higher degree of Ptolemy.
Domesticating plants marked a major turning point for humans. The beginning of an agricultural way of life and more permanent civilizations. Humans no longer had to wander to hunt animals and gather plants for their food supplies. Agriculture, the cultivating of domestic plants allowed fewer people to provide more food.
One way landforms shift over time is by weathering. Weathering occurs as the powers of nature break down the rocks into smaller pieces. The weathering of water , ice and wind helped to create these natural arcs in Utah.
