Its dense atmosphere is largely made up of carbon dioxide, and contains some thick clouds of sulfuric acid. Venus is both the morning star and the evening star. Since planets, just like the Sun and Moon, rise and set, it was always Venus that people saw, but did not realize it. Check out some cool Quicktime animations of the surface of Venus. 23.45 o The Earth has just as much carbon dioxide as Venus does, but the temperature was never hot enough for it to evaporate into the atmosphere, so that carbonate rocks are the main reservoir of carbon dioxide.
Earth too has volcanoes, but is unique in having plate techtonics.
The Earth has a significant magnetic field which protects the planet from solar bombardment, and which reverses direction every hundred thousand or so years. The homeland of the Martians is a cold, highly fluctuating environment with a thin atmosphere made mostly of carbon dioxide. Mars is home to Olympus Mons, the largest volcano in the solar system. Jupiter is also home to the Giant Red Spot, a cyclonic storm that has persisted for 300 years. The most intriguing aspect of Saturn is its large and elaborate ring system.