Original sentence: , landscapes and landforms as interpreted by humans), similar to what "supercontinents" and other landmasses are to physical geography, and definitions may vary.About 60 percent of the world's human population lives in Asia.Continents are a concept of human geography (i.If is often unclear what Asia precisely consists of.It is traditionally defined as the part of the landmass of Africa-Eurasia lying east of the Suez Canal, east of the Ural Mountains, and southeast of the Caucasus, Caspian and Black Seas.The boundary between Asia and Europe is commonly believed to run via the Dardanelles, the Sea of Marmara, the Bosporus, through the Black Sea, the Caucasus Mountains, the Caspian Sea, the Ural River to its source, and the Ural Mountains to the Kara Sea at Kara, Russia.The concept of the three continents of the Old World goes back to Antiquity
Edited sentence: Continents are a concept of human geography, landscapes and landforms as interpreted by humans, instead of physical geography, and definitions may vary.It is often unclear what Asia precisely consists of.It is traditionally defined in the West as the part of the landmass of Africa-Eurasia lying east of the Suez Canal, east of the Ural Mountains, and southeast of the Caucasus, Caspian and Black Seas.The boundary between Asia and Europe is traditionally believed to run via the Dardanelles, the Sea of Marmara, the Bosporus, through the Black Sea, the Caucasus Mountains, the Caspian Sea, the Ural River to its source, and the Ural Mountains to the Kara Sea at Kara, Russia.The concept of the three continents of the Old World goes back to Classical Greek times.Using this conventional definition, about 60 percent of the world's human population lives in Asia