Unlike Earth, Venus lacks plate tectonics to form volcanoes known as "compound volcanoes." Instead, Venus' geography is characterized by "shield volcanoes" generated by hot spots is the difference between volcanism on venus and that around the ring of fire on earth.
Mars and Venus have only shield volcanoes. On these planets, geological processes are vertical and plate tectonics, and significant horizontal tectonic movements do not occur.
The presence of CO2 in Venus' surface atmosphere indicates that volcanism is currently active and clouds of SO2 and sulfuric acid are present.
First, because of the high pressure, Venusian lava requires a much higher gas content than terrestrial lava to explode. Second, the main gas that causes lava explosions on Earth is water, much less so on Venus. Finally, many viscous lavas and explosive eruptions occur near Earth's plate subduction zones.
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