The Planet Quiz Show  

Answer:    Venus, Earth, and Mars

Venus, Earth, and Mars all have volcanoes on their surfaces that have been photographed. Although long suspected on Venus, the Magellan spacecraft in 1989 provided high-resolution surface radar images of volcanoes, volcanic vents, lava fields, and fault zones, as well as impact craters from large meteorites on Venus. Variations in the amount of sulfur dioxide (SO2), a gas which is commonly released when volcanoes erupt, were measured by earlier spacecraft and may indicate recent active volcanism on Venusís surface. Mercury is also sure to have volcanoes on its surface, since its topography and history are nearly identical to the moon's surface, where volcanoes and lava fields have been photographed and studied. NASA's MESSENGER spacecraft did not photograph specific volcanic structures when it made its first flyby of Mercury in January 2008. Its next flyby of Mercury occurs on October 16, 2008. If Mercury is used as a Planet Quiz Show answer, it will be accepted.

Venus pancakes
Venus's pancake volcanoes are flattened by its heavy atmosphere which would also crush humans.

Earth Mt. St. Helens
Earth's Mt. Saint Helens volcano in the state of Washington blew its stack in May of 1980.

Mars Olympus Mons
Mars's Olympus Mons would stretch across Pennsylvania and New Jersey. It is once again considered the largest volcano in the solar system.

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