Question 1
The high surface temperatures of ________ have been attributed to the greenhouse effect.
◦ Mars
◦ Mercury
◦ Uranus
◦ Venus
Question 2
________ are found both on Mars and Earth.
◦ Heavily cratered landscapes preserved from early in the planets' histories
◦ Active volcanoes
◦ Oceans
◦ Erosional features related to flowing water