1.) What are the eight subfields of physical geography and what do they focus on? 2.) What is the difference between an open system and a closed system? 3.)What are the 5 fields of the Earth's system? 4.) List natural and artificial features found on the surface of the earth. 2.) What is the difference between an open system and a closed system? 3.)What are the 5 fields of the Earth's system? 4.) List natural and artificial features found on the surface of the earth. 1.