Question 1
The surface features of ________ are known only through satellite radar mapping.
◦ Jupiter
◦ Venus
◦ Mercury
◦ Mars
Question 2
Compared to Earth's atmosphere, the atmosphere of Mars has surface pressures that are ________.
◦ 1.5 times those on Earth; main gases are methane and nitrogen
◦ 3 times those on Earth; major gases are water vapor and carbon dioxide
◦ 0.1 times those on Earth; major gases are water vapor and carbon dioxide
◦ one-half those on Earth; main gases are methane and nitrogen