On August 1, 2011, Mars was easily visible from Earth between a. 9:00 pm to midnight.
b. sunset to sunrise.
c. 3:00 am and 3:00 pm.
d. 3:00 am to sunrise.​

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Answer volcanic outgassing;

Answer carbon dioxide ice;

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!