Which is an effective way scientists study ancient climates?

a, read very old books

b. review old maps

c. drill deep into glaciers

d. study other planets

Answerglycogen;

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!