What is a model of the earth’s surface? a. a landmark c. a sphere b. a map d. a circumference

A map. However, if "a sphere" is referring to a globe, then it would be a sphere. Good luck! <3

Historians are researchers of the past or people who understand the history of people. with this field, they must possess qualities such as being unbiased, patient, efficient reader, has a knack for logic and critical thinking and reasoning, disciplined, open-minded, resourceful, with good analytical ability, good reasoning skills and problem solving!