A tectonic plate is part of the Earth's lithosphere and can be best described as O a large, easily broken block. O a large, fairly rigid block. O a small , easily eroded block. O a small, fairly rigid block.

What exactly do you mean 

Answerair masses develop near the equator are warm; tropical air mass

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!