Final answer:
Small steep-sided volcanoes that erode quickly might refer to cinder cones. Volcanic structures like Mount St. Helens show how volcanic activity and subsequent erosion can rapidly alter a landscape.
Step-by-step explanation:
The term for a small steep-sided volcano that erodes quickly could describe cinder cones or other similar volcanic structures. Volcanoes like Mount St. Helens experienced a major eruption in 1980, which resulted in the rapid erosion of its slopes due to a landslide, subsequent volcanic ash deposition, and the creation of valleys carved out by rainfall. On Venus, there are pancake-shaped volcanoes resulting from the eruption of highly viscous lava that spreads out evenly. Mars's Olympus Mons has very few impact craters on its surface, suggesting it might still be geologically active. Extrusive volcanic activity is when magma exits the Earth's interior onto the surface, and the material, including volcanic ash, can be rapidly eroded, especially when it is loose and unconsolidated.
Planetary bodies like Venus and Mars also exhibit different types of volcanic features, including pancake-shaped volcanoes and Olympus Mons, indicative of possible ongoing volcanic activity.