Basic names of volcanic rocks are based on the rock's

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Basic names of volcanic rocks are based on the rock's silica content. The amount of silica in the magma affects its viscosity, which in turn affects its ability to flow and the type of eruptions that it can produce. Volcanic rocks with low silica content, such as basalt, have a lower viscosity and tend to produce less explosive eruptions, while those with higher silica content, such as rhyolite, have a higher viscosity and tend to produce more explosive eruptions.

Basic Names of Volcanic Rocks Are Based on the Rock's