Earthlike Planets: Venus and Mars

A self-checking practice quiz on the Earthlike planets Venus and Mars: Venus’s atmosphere, greenhouse effect, surface and rotation; Mars’s surface features, atmosphere and climate; water and the search for life; and a comparison of Venus, Earth, and Mars. Every question is multiple choice and shown one at a time, and the set is drawn fresh each time you take it. At the end you receive a report showing how many you answered correctly.