On a sunny day, would the air over a piece of land be cooler than the air over a bordering lake?

Yes because the cool air from a near by water source migrates toward the land to take the place of the hot air rising while the air over an area of water would be warmer because it is absorbing solar energy from the sun

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!