Comparing the clouds of Earth and Venus, we find that: a. Venus has much more carbon dioxide, so dry ice clouds dominate. b. like ours, they rotate around Venus slower than Venus rotates on its axis. c. both are made chiefly of water vapor. d. Venus is too hot for clouds to form, so we see only a barren world telescopically. e. ours lie in the troposphere, within 10 kilometer of our surface, but Venus has a higher troposphere, with its clouds about 40 kilometers high.